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
US Open (tennis) on grass courts at the Newport Casino in Newport, Rhode Island. That year, only clubs that were members of the United States National Lawn Tennis Association (USNLTA) were permitted to enter. Richard Sears won the men's singles at this tournament, which was the first of his seven consecutive singles titles. From 1884 through 1911, the tournament used a challenge system whereby the defending champion automatically qualified for the next year's final, where he would play the winner of the all-comers tournament. In 1915, the national championship was relocated to the West Side Tennis Club in Forest Hills, Queens, New York