2017 U.S. Open winner Sloane Stephens and U.S. soccer star Jozy Altidore are engaged 0 16 29 Apr 2019 23:56 USATODAY (Sports Top Stories) 2017 U.S. Open tennis champion Sloane Stephens and U.S. soccer player Jozy Altidore are engaged. The couple announced the news Monday on Twitter.