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
1971 US Open – Women's Singles 1971 US Open – Women's Singles Two-time reigning champion Margaret Court did not defend her title. Billie Jean King defeated Rosemary Casals 6–4, 7–6 (5-2) in the final to win the Women's Singles tennis title at the 1971 US Open. This tournament was notable for being the first Grand Slam appearance in which Chris Evert competed in the main draw, she made it to the semi-final. She competed in 19 consecutive US Open tournaments until her retirement in 1989. The seeded players are listed below. Billie Jean King is the champion; others show the round in which they were eliminated.