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 LA Tennis Open Open Series. In addition to the singles and doubles events, a Legends Invitational Singles competition was held, featuring Michael Chang, Stefan Edberg and Jim Courier, winner of the competition at the 2008 Countrywide Classic. The LA Tennis Open kicked off with the "Millennium Challenge" featuring Pete Sampras returning to the University of California, Los Angeles (UCLA) to play Marat Safin in a rematch of their 2000 US Open final, won by the Russian 6–4, 6–3, 6–3. Fourteen-time Grand Slam champion Sampras, who held the World No. 1 ranking for a record 286 weeks, was recognized as the 2009 LA Tennis