answers: Sloane Stephens
context: first player in history to reach the semifinals of the US Open 10 years apart and then do so another 10 years apart (1997, 2007, and 2017). 2017 US Open – Women's Singles Angelique Kerber was the defending champion, but was defeated in the first round by Naomi Osaka. Kerber became the second US Open defending champion to lose in the first round after Svetlana Kuznetsova in 2005. Sloane Stephens won her first Grand Slam title, defeating Madison Keys in the final, 6–3, 6–0. It was the first all-American women's final at the US Open since 2002, and the second </s> 2017 US Open (tennis) The 2017 US Open was the 137th edition of tennis' US Open and the fourth and final Grand Slam event of the year. It was held on outdoor hard courts at the USTA Billie Jean King National Tennis Center in New York City. Experimental rules featured in qualifying for the main draw as well as in the junior, wheelchair and exhibition events. Stan Wawrinka and Angelique Kerber were the previous year's men's and women's singles champions. Neither managed to defend their title as Wawrinka withdrew before the start of the tournament due to a knee injury </s> 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
question: who won the us open women 's tennis tournament