<P> 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 . </P> <P> 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 that ended his season, while Kerber lost in the first round to Naomi Osaka . </P> <P> The men's singles tournament concluded with Rafael Nadal defeating Kevin Anderson in the final, while the women's singles tournament concluded with Sloane Stephens defeating Madison Keys in the final . </P> <P> The 2017 US Open was the 137th edition of the tournament and took place at the USTA Billie Jean King National Tennis Center in Flushing Meadows--Corona Park of Queens in New York City, New York, United States . The tournament was held on 14 DecoTurf hard courts . </P>

Who won the us open mens single title 2017