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) courts just outside the East Gate) consisting of four "show courts" (Arthur Ashe Stadium, Louis Armstrong Stadium, the Grandstand, and Court 17), 13 field courts, and 5 practice courts. The main court is the 23,771-seat Arthur Ashe Stadium, which opened in 1997. A US$180 million retractable roof was added in 2016. The stadium is named after Arthur Ashe, the African-American who won the men's singles title at the inaugural US Open in 1968, the Australian Open in 1970, and Wimbledon in 1975 and who was inducted into the International Tennis Hall of Fame in 1985. The next largest court is