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) (clay and hard). The US Open is the only Grand Slam tournament that has been played every year since its inception. During the 2006 US Open, the complex was renamed to "USTA Billie Jean King National Tennis Center" in honor of Billie Jean King, a four-time US Open singles champion and women's tennis pioneer. From 1984 through 2015, the US Open deviated from traditional scheduling practices for tennis tournaments with a concept that came to be known as "Super Saturday": the men's and women's finals were played on the final Saturday and Sunday of the tournament respectively, and their respective