(CNN) -- The top three seeds in the Olympics men's singles, Roger Federer, Rafael Nadal and Novak Djokovic, all moved easily into the third round with convincing wins in Beijing on Tuesday.
Nadal was in blistering form as he reached the Beijing third round with the loss of just three games.
The women's draw also saw dominant performances from the Williams sisters and Serbian world number one Jelena Jankovic.
Swiss top seed Federer breezed to a 6-2, 6-4 win over Rafael Arevalo of El Salvador, ranked 447th in the world and only playing because of his country's small number of competitors.
"To be playing a player with a very low ranking in a very big pressure situation for me, I have nothing to win, only (everything) to lose," said Federer. "It was all a matter of getting through: hopefully not getting a fright or anything, which I didn't."
Second seed Nadal crushed Lleyton Hewitt 6-1 6-2, while Serbian third seed Djokovic beat German veteran Rainer Schuettler 6-4 6-2.
Nadal, who will take over from Federer as world number one next week, was always in full control against the Australian former number one, now ranked 38th in the world.
Hewitt had played a gruelling doubles match that stretched into the early hours of Tuesday after going to 18-16 in the third set and his tiredness was noticeable as he crumbled under Nadal's relentless attack. "I played very well. It was one of the best matches I have played," said Nadal.
The Spaniard will play Russian Igor Andreev in the third round, with Federer meeting Czech Tomas Berdych, the 17th seed, who knocked him out in Athens four years ago.
Djokovic faces a tricky tie against Russian 13th seed Mikhail Youzhny.
Defending Olympic champion Nicolas Massu of Chile was dumped out by number seven seed David Nalbandian, while Russian fourth seed Nikolay Davydenko went down 7-5 6-3 to Paul-Henri Mathieu.
Mathieu is joined in the next round by French compatriots Gilles Simon, the 10th seed, and Gael Monfils after their respective wins over Guillermo Canas of Argentina and Romanian Victor Hanescu.
In the women's draw, the Williams sisters and Jankovic were in blistering form.
World number one Jankovic, the top player in the absence through injury of compatriot Ana Ivanovic, brushed aside Ukraine's Alona Bondarenko 7-5 6-1.
The 23-year-old from Belgrade was wearing a strapping on her troublesome right calf and did not look completely at ease but said she hoped it would continue to get better. "I took some painkillers to be able to play, otherwise it's quite sore," Jankovic said.
The Williams sisters both confirmed their status as among the hot favorites for gold in the singles, which has been hit by a raft of withdrawals.
Fourth seed Serena took just 44 minutes to dispatch Australia's Samantha Stosur, reeling off the last 10 games to love. "It was clean," said Williams, who missed the 2004 Games in Athens through injury. "My way of improving on it is to keep it up."
The 2000 doubles winner's third round opponent is French 15th seed Alize Cornet, who subdued a vociferous home crowd in outclassing China's Peng Shuai 6-2 6-2.
Serena's sister Venus, the seventh seed, demolished Czech Iveta Benesova 6-1 6-4, however, three other women's seeds were knocked out.
Slovakia's Daniela Hantuchova, the 10th seed, was thrashed by Danish teen Caroline Wozniacki, Polish eighth seed Agnieszka Radwanska went down to Italian Francesca Schiavone, and Swiss number 13 seed Patty Schnyder was beaten by Austrian Sybille Bammer.
Home hopes will be carried into the next round by Zheng Jie and Li Na, who play Dinara Safina and Kaia Kanepi of Estonia respectively.
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