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
2015 US Open – Women's Singles 2015 US Open – Women's Singles Serena Williams was the three-time defending champion, but she was defeated in the semifinals by the unseeded Roberta Vinci. In doing so, Williams missed the opportunity to become only the fourth woman (after Maureen Connolly, Margaret Court and Steffi Graf) to complete a calendar year Grand Slam by winning the tournament. She was also trying to set a new Open Era record by winning her seventh US Open singles title. Flavia Pennetta won her first Grand Slam championship, defeating Vinci in the final, 7–6, 6–2. Pennetta was the first maiden Grand Slam champion since