2009 US Open – Women's Singles second round. This was also the final Grand Slam singles appearance of Ai Sugiyama, who was on a record-breaking 62nd consecutive Grand Slam singles appearance, lost in the first round to Samantha Stosur. Sugiyama's record-breaking run of 62 consecutive Grand Slam singles appearances remains unbeaten as of 2019. Dinara Safina "(Third round)" 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
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