Question: who won women's singles us open 2017?
Answer: Sloane Stephens

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 time in three years that the final featured two first - time Grand Slam singles finalists from the same country . Stephens became the second unseeded woman in the Open era to win the US Open after Kim Clijsters in 2009 .