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
2009 US Open – Men's Singles history. 2009 US Open – Men's Singles Roger Federer was the five-time defending champion, but was defeated by Juan Martín del Potro in the final, 3–6, 7–6, 4–6, 7–6, 6–2. This was del Potro's first and so far only major title, although he reached a second final in 2018. Federer was attempting to become the first man to win a sixth consecutive US Open title after Bill Tilden in 1925 during the Pre-Open era. He was also vying to become the first man to win Grand Slams on clay, grass and hard court in the same calendar year after he