Serena's golden year

Updated 7:28 AM ET, Wed November 20, 2013
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Serena Williams poses with her coach Patrick Mouratoglou after reclaiming the year-end world No. 1 ranking she last held in 2009. Matthew Stockman/Getty Images/file
The American enjoyed her best year in 2013, capped with a successful defense of her season-ending WTA Championships crown. She won 11 titles, including the French and U.S. Open trophies, and finished the year with 78 wins and just four defeats. OZAN KOSE/AF/Getty/file
Serena became the oldest WTA Championships winner by beating Li Na in the Istanbul final and amassed $12.3 million over the season. She became the first player to win 11 titles in a year since Martina Hingis bagged 12 in 1997. Dean Mouhtaropoulos/Getty Images
It marked a sensation return to form for Serena, who had tumbled to 175 in the world after a couple of injury-blighted seasons. After surviving a life-threatening blood clot, and coming back from a serious foot injury, she began a long journey to get back to the top of the rankings. Chris Hyde/Getty Imagesfile
One of the lowest moments of Serena's career came with a first round defeat to unseeded opponent Virginie Razzano at the French Open in 2012. It led many to wonder whether she could recapture the glorious heights of yesteryear. THOMAS COEX/AFP/Getty Images/file
While still in Paris, Serena sought out coach Patrick Mouratoglou for help with her game. The results were immediate, Williams going on to win Wimbledon, two Olympic gold medals, the U.S. Open and the WTA Championships. Lucas Dawson/Getty Images/file
Mouratoglou, with whom Serena has been romantically linked, helped Serena win 16 titles in 16 months, with a record of 95 victories and five defeats. He told CNN of that meeting in Paris: "What surprised me at that point was the motivation she had. She really was prepared to do anything to come back to the top." Clive Brunskill/Getty Images/file
Twelve months on from that shock defeat in the first round, Serena banished her demons by winning her second French Open title, and her first since 2002, after beating defending champion Maria Sharapova. Julian Finney/Getty Images/file
Despite a fourth round exit to Sabine Lisicki at Wimbledon, Serena's dominance was restored in New York as she took the U.S. Open title. STAN HONDA/AFP/Getty Images
Williams is now just one grand slam title behind the 18 won by Chris Evert and Martina Navratilova. AP Photo/Charles Krupa
Despite having her most successful year, Mouratoglou thinks Serena can improve yet further. "If she plays her type of game with more efficiency, like being maybe even more aggressive, adding some volleys, she can give another level, which is maybe a bit frightening, but I think she can." Clive Brunskill/Getty Images