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
2018 US Open – Women's Singles final 2018 US Open – Women's Singles final The 2018 US Open Women's Singles final was the championship tennis match of the Women's Singles tournament at the 2018 US Open. It was contested between Serena Williams and Naomi Osaka, seeded 17th and 20th respectively. Osaka defeated Williams in straight sets, 6-2, 6-4 in one hour and 19 minutes. The match was historically significant for both players. It was Williams' first US Open after a 12-month hiatus to give birth to her first child in September 2017, and second attempt since her pregnancy (after that year's Wimbledon) to equal Margaret Court's all-time