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 (tennis) to the quarterfinals with a retirement of Russian Nikolay Davydenko to face the Swiss Roger Federer, who beat Spaniard Tommy Robredo in straight sets. This would mark the third time the duo of Federer and Söderling has met in a Grand Slam in 2009, including the 2009 French Open final and the 2009 Wimbledon Championships fourth round, which were both won by Federer. Spaniard Fernando Verdasco beat American John Isner to advance into the quarterfinals, which means for the first time in US Open history no American male advanced into the quarterfinals of the tournament. Verdasco would face Serbian Novak