2009 US Open – Women's Singles 2009 US Open – Women's Singles Serena Williams was the defending champion, but was defeated in the semifinals by the eventual champion Kim Clijsters. Clijsters defeated first time Grand Slam finalist Caroline Wozniacki in the final to win her second US Open title. Clijsters became the first unseeded player and wild card to win the tournament, and the first mother to win a major since Evonne Goolagong in 1980. Following her win, she made 19th in the rankings. This was the final Grand Slam appearance for former two-time Grand Slam champion, Amélie Mauresmo, who lost to Aleksandra Wozniak in the
2017 US Open (tennis) record $3.7 million goes to both the men's and women's singles champions, which is increased to 7.5 percent from last year. This made the US Open the most lucrative and highest paying tennis grand slam in the world, leapfrogging Wimbledon in total prize money fund. Prize money for the US Open qualifying tournament is also up 49.2 percent, to $2.9 million. The total prize money for the wheelchair tennis events was $200,000. Seeds are based on the ATP and WTA rankings as of August 21, 2017. Rank and points before are as of August 28, 2017. Rankings as of August