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) women's singles final, which was pushed into primetime by rain delays. Since 1978, the US Open has been played on a hard court surface called Pro DecoTurf. It is a multi-layer cushioned surface and classified by the International Tennis Federation as medium-fast. Each August before the start of the tournament, the courts are resurfaced. Since 2005, all US Open and US Open Series tennis courts have been painted a shade of blue (trademarked as "U.S. Open Blue") inside the lines to make it easier for players, spectators, and television viewers to see the ball. The area outside the lines is