Story highlights
- American Michael Phelps earns his 18th gold medal in what's expected to be his last race
- Sun Yang adds to China's growing gold tally with a win in the men's 1500-meter freestyle
- Team USA just squeaks past Lithuania in the men's basketball competition
Olympics fans will revel in track and field's most anticipated event Sunday, and the men's 100 meters will not lack for drama as Jamaican sprinter Usain Bolt attempts to defend his title against his fellow countryman.
Bolt became a household name with his gold medal win in the 2008 Beijing Games. His compatriot, Yohan Blake, is proving to be his main competition as they face off Sunday evening . Americans Tyson Gay, Justin Gatlin and Ryan Bailey will also be in the men's 100 final.
Among the first events of the day is the women's marathon, which will pit favorites Mary Keitany from Kenya against Russian Liliya Shobukhova.
Noticeably absent from the race will be world record holder Paula Radcliffe, from Great Britain, who withdrew citing a recent injury.
In one of tennis' most anticipated showdowns, World No. 1 Roger Federer faces hometown favorite Andy Murray, whom he defeated at Wimbledon last month.

Photos: Day 8: The best photos of the Olympics

Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Shelly-Ann Fraser-Pryce of Jamaica celebrates winning the gold in the women's 100-meter final on Saturday, August 4. Check out Day 7 of competition from Friday, August 3. The Games ran through August 12.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – The U.S. swimming team reacts to winning gold in the 4x100-meter medley relay.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Nikola Raden of Serbia takes a shot at goal during a men's preliminary round water polo match against the United States.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Sprinters explode out of the starting blocks in the in the women's 100-meter final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Jessica Ennis of Great Britain is overcome with emotion after winning gold in the women's heptathlon.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Michel Torneus of Sweden competes in the men's long jump final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Andrey Demanov of Russia celebrates during the men's 94kg weightlifting final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Spain's rightwing Victor Tomas Gonzalez jumps to shoot during the men's preliminary handball match against Hungary.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Mohamed Farah of Great Britain celebrates winning gold in men's 10,000-meter final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Greg Rutherford of Great Britain on his way to winning the gold medal in the men's long jump final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Michael Phelps, center, competes in the men's 4x100-meter medley relay final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Left to right: Mamadou Kasse Hanne of Senegal and David Greene of Great Britain after competing in the men's 400-meter hurdles semifinal. Greene advanced; Hanne did not.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – China's Sun Yang reacts after he took gold in the men's 1,500-meter freestyle final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Athletes start in the women's 100-meter semifinal at Olympic Stadium.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Nadine Muller of Germany competes in the final of the women's discus throw.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Left to right: Australian center Aron Baynes, British forward Dan Clark and British forward Robert Archibald eye the ball during a men's preliminary round group B basketball match.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Courtney Hurley of the United States celebrates after she and her teammates defeated Russia in the the bronze medal match, 31-30, in women's epee team fencing.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Maria Antonelli of Brazil dives for the ball during a women's beach volleyball round-of-16 match between Brazil and the Czech Republic.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Andrey Demanov of Russia celebrates during the men's 94 kilogram weightlifting final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Susannah Scanlan of the United States celebrates her team's 31-30 victory against Russia in the bronze medal match in women's epee team fencing.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Franziska Goltz of Germany competes in laser radial women's sailing in Weymouth, England.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Dani Samuels of Australia competes in the women's discus throw final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Australian center Aron Baynes, left, British forward Pops Mensah-Bonsu, center, and Australian forward David Andersen, right, vie during a men's preliminary round group B basketball match.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – China's Sun Yang reacts after winning gold in the men's 1500-meter freestyle final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Competitors prepare for the start of the women's 4x100-meter medley relay.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Jessica Ennis of Great Britain celebrates winning gold in the women's heptathlon.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Christopher Tomlinson of Great Britain competes in the men's long jump final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Dani King of Great Britain celebrates winning the gold medal and breaking the world record in women's team pursuit track cycling.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Greece's David Kavelasvili competes during the men's 94-kilogram group B weightlifting event.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – A performer dressed in a Union Flag suit and holding a mock Olympic flame entertains crowds on the South Bank in London.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Members of Great Britain's women's hockey team slump to the ground after losing to China during a preliminary match.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – France's Delphine Reau competes in the women's trap shooting final at the Royal Artillery Barracks in London. She won the bronze medal.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Mexican defender Israel Jimenez, left, challenges Senegalese forward Kalidou Yero in a men's football quarterfinal match at Wembley Stadium in London.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – The United States' Deron Williams shoots during a men's basketball preliminary round match against Lithuania.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Robert Forstemann of Germany, left, competes against Njisane Nicholas Phillip of Trinidad and Tobago during the men's sprint round-of-eight cycling event.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Australia's Corey Cogdell, sporting the map of her country on her glasses, competes in the women's trap shooting final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Peter Kirkbride of Great Britain competes in the men's 94-kilogram weightlifting final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Tara Whitten, Gillian Carleton and Jasmin Glaesser of Canada celebrate as they win the bronze medal in women's team pursuit track cycling.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Brazil's Leandro Damiao, left, vies with Honduras' Maynor Figueroa during a men's football quarterfinal match at St. James' Park in Newcastle upon Tyne, England.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – William Priddy, left, spikes as Russia's Nikolay Apalikov, center, and Maxim Mikhaylov, right, attempt to block during a men's preliminary pool B volleyball match.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – The United States' Kobe Bryant jumps with the ball during a men's preliminary round group A basketball match against Lithuania.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Jaime Nielsen, Alison Shanks and Lauren Ellis of New Zealand in action during the women's team pursuit track cycling first round heat against Belarus.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Roniel Iglesias Sotolongo of Cuba departs the ring after defeating Everton dos Santos Lopes of Brazil in a light-welterweight (64 kilogram) match. Iglesias Sotolongo was awarded an 18-15 points decision, sending him to the quarterfinals.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Savannah Vinsant of the United States competes in women's trampoline.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Dutch fans cheer on their compatriots competing in the first equestrian individual show jumping qualifier in Greenwich Park.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Tom Slingsby of Australia competes in men's laser sailing in Weymouth, England.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Senegal celebrates after Ibrahima Balde scored a goal during the men's football quarterfinal match against Mexico.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Yakup Sener, left, of Turkey is counted after being knocked down by Uktamjon Rahmonov, center, of Uzbekistan during the round of 16 light-welterweight (64 kilogram) match. Rahmonov was awarded a 16-8 points decision.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Japanese players celebrate after scoring the equalizer in Japan's 1-1 draw with Belgium in a preliminary women's hockey round.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Rebecca Gallentree of Great Britain competes in the women's 3-meter springboard diving semifinal.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Competition begins in the 470 women's class sailing in Weymouth, England.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Fans cheer as Olympic road cycling gold medalist and Tour de France winner Bradley Wiggins greets fans in Hyde Park.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Ireland's Bill Twomey, on Tinka's Serenade, competes in the first individual show jumping qualifier.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Jessica Rossi of Italy bites her gold medal on the podium during the medal ceremony for women's trap shooting.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – China's Zhao Yunlei, left, and Tian Qing, right, play against Mizuki Fuji and Reika Kakiiwa (not pictured) in the women's doubles badminton final match.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Tania Cagnotto of Italy competes in the women's 3-meter springboard diving semifinal.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Sun Yujie and Xu Anqi of China celebrate after China beat Russia in the women's epee team fencing semifinal.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Serena Williams reacts after defeating Maria Sharapova of Russia to win the gold medal in women's singles tennis at Wimbledon. Williams won 6-0, 6-1.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Russia's Maria Sharapova reacts after losing a point to Serena Williams during the women's singles tennis final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Serena Williams serves to Russia's Maria Sharapova during the women's singles tennis final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – A boy watches as athletes make their way past Buckingham Palace while competing in the cycling leg of the women's triathlon at Hyde Park.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Hiroki Sakai of Japan clashes with Emad Moteab of Egypt to score during the men's football quarterfinal match at Old Trafford in Manchester, England.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Great Britain's Louise Hazel competes in the women's heptathlon javelin throw.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Germany's Anne Haug competes in the cycling leg of the women's triathlon.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Wissem Hmam, left, and Issam Tej, right, of Tunisia defend against Christopher McDermott of Great Britain during a men's handball preliminaries match in group A.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Tatyana Chernova of Russia reacts during the women's heptathlon javelin throw.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – The Australian women's hockey team celebrates during a preliminary round group B match against South Africa.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Spectators watch a rowing event as rain falls over Eton Dorney Rowing Centre west of London.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Jessica Ennis of Great Britain competes in the women's heptathlon long jump.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Robin Garnham of Great Britain shoots past Issam Tej of Tunisia during a men's handball preliminaries match in group A.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – China's Wang Xin plays against India's Saina Nehwal in the bronze medal women's singles badminton match.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Left to right: Mark Barriga of the Philippines and Birzhan Zhakypov of Kazakhstan in action during the men's light fly (46-49 kilogram) boxing.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Katherine Driscoll of Great Britain competes in trampoline.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Spectators leave Hyde Park after the women's triathlon event.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Juan Esteban Arango Carvajal of Colombia sprints during the men's omnium track cycling 250-meter time trial.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Laura Bennett of the United States runs in the women's triathlon Saturday in Hyde Park.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Yujie Sun of China celebrates after beating Britta Heidemann of Germany during the women's epee team fencing quarterfinals.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Usain Bolt of Jamaica signals a No. 1 after competing in the men's 400-meter round 1 heat.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Rasmus Quist and Mads Rasmussen of Denmark celebrate winning gold in the lightweight men's double sculls final.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Xi Zhang of China blocks Ekaterina Khomyakova of Russia during a women's beach volleyball match.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Captain Maartje Paumen of the Netherlands challenges Kim Jong Hee of South Korea during a women's hockey match.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Runners compete in a women's 3000-meter steeplechase heat at Olympic Stadium.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Valentyna Horpynych Zhudina of Ukraine lies on the track after competing in the women's 3000-meter steeplechase.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Serbia's left back Momir Rnic, left, jumps to shoot during a men's preliminary handball match against South Korea.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Sofia Assefa of Ethiopia, left, Habiba Ghribi of Tunisia and Emma Coburn of the United States compete in the women's 3,000-meter steeplechase.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Katherine Copeland and Sophie Hosking of Great Britain celebrate with their gold medals during the medal ceremony for the lightweight women's double sculls.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Hersony Canelon of Venezuela, left, races against Pavel Kelemen of Czech Republic during the men's sprint track cycling 1/16 finals.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Japan's Kensuke Nagai, left, scores past Egypt's goalkeeper Ahmed Al-Shenawi, center, and Egypt's defender Saadeddine Saad, right, during the quarter final football match Saturday.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Gerald Phiri, left, of Zambia, Tyson Gay, center, of the United States and Richard Thompson of Trinidad and Tobago compete in the Men's 100-meter Round 1 Heats.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Holly Bleasdale of Great Britain makes a vault in the Women's Pole Vault qualification at Olympic Stadium.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Oscar Pistorius of South Africa competes in the men's 400-meter qualifying heat.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Rusheen McDonald of Jamaica, Luguelin Santos of the Dominican Republic, Oscar Pistorius of South Africa and Maksim Dyldin of Russia compete in the first round of the men's 400-meter on Saturday.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Luguelin Santos, left, of the Dominican Republic shakes hands with Oscar Pistorius of South Africa after competing in the preliminary heat of the men's 400-meter on Saturday.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Haifeng Fu of China celebrates a victory in the men's doubles badminton semifinal match Saturday against Boon Heong Tan and Kien Keat Koo of Malaysia.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Spectators watch the track and field events at Olympic Stadium.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Jason Kenny of Great Britain is cheered on by spectators as he sets a new Olympic record during the men's sprint track cycling qualifying event.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Fans gather to watch athletes compete in the swimming stage of the women's triathlon in Hyde Park.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Athletes dive into the water at the start of the women's triathlon at Hyde Park.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Athletes swim the first leg of the women's triathlon during Saturday.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – From left, Sara Mohamed Baraka and Fatma Rashed of Egypt, Maria Clara Rohner and Milka Kraljev of Argentina, and Luana De Assis and Fabiana Beltrame of Brazil compete in the lightweight women's double sculls finals at Eton Dorney in Windsor.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Germany's Markus Steuerwald dives for the ball during the men's preliminary volleyball match between Germany and Tunisia.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Britain's rightback Steven Larsson, right, tries to take a shot as Tunisia's leftback Wael Jallouz blocks during the men's preliminary Group A handball match.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Iran's Soulmaz Abbasiazad rests after competing in the women's single sculls final of the rowing event Saturday.
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Photos: Day 8: The best photos of the Olympics
Day 8: The best photos of the Olympics – Denmark's Mathias Boe and Carsten Mogensen celebrate their victory over Chung Jae Sung and Lee Yong Dae of South Korea during the semifinal men's doubles badminton match. Check out photos from Day 9 of the competition on Sunday, August 5.
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History ahead for the Summer Games 03:08

First British athletes to win gold 03:52
Federer, who has 17 grand slam titles under his belt, is hoping to complete a career golden grand slam.
Only Andre Agassi and Rafael Nadal have achieved the feat of claiming a full set of grand slam titles and backed it it with Olympic gold in the singles.
Sunday's events follow an action-packed Saturday that saw the host nation rake in six wins, bringing its gold medal count to 14.

The new celebrities of the Olympic games 04:21
Only China and the United States have more.
Jessica Ennis earned the heptathlon gold, Greg Rutherford scored a long jump win and Mo Farah's sprint to victory made him the first British runner ever to do so in the 10,000 meter competition.
Meanwhile, the U.S. leads the gold medal count with 26 among its 54 total medals. China is second with 25 golds and 53 overall.
But history on Saturday also favored the leaders, as the most decorated Olympian of all time tallied another win with his American teammates in the 4 x 100-meter medley relay, handing Michael Phelps his 18th gold medal in the last race of his storied swimming career.
The U.S. win put an already unsurpassed Phelps at 22 total medals over three Olympic Games: 18 gold, two silver and two bronze. Japan placed second in Saturday's race, while Australia finished third.
In the last day of London's swimming competition, the American women won the 4x100-meter medley relay race, setting a new world record with a time of 3:52.05. Australia netted silver.
Sun Yang also added to China's growing gold tally with a win in the men's 1500-meter freestyle. Ryan Cochrane of Canada finished second, while Oussama Mellouli of Tunisia took bronze.
But on the hardwood Saturday, U.S. Olympic command seemed far less convincing.
Team USA squeaked past Lithuania in a preliminary round basketball contest, winning by just five points after trailing by two in the waning minutes of the fourth quarter -- the first scare for the favored American squad after a series of dominating performances that had bolstered an aura of invincibility.

Usain Bolt's street art portrait 02:27

Oscar Pistorius' fighting spirit 02:52

Samuel L. Jackson's Olympic tweets 01:09
Elsewhere in London, Serena Williams completed a "career Golden Slam" at the 2012 Games, adding for the United States an Olympic women's singles tennis gold medal to her four tennis major titles.
Also on the track, double-amputee sprinter Oscar Pistorius, who runs on special carbon fiber blades and is nicknamed "The Blade Runner," came in an impressive second in his heat of the men's individual 400-meter race, thus qualifying for Sunday's semifinals.
He is the first person to compete in the able-bodied Olympics using prosthetic legs -- and he will also compete in the Paralympics later this summer.