Stan Wawrinka beats Steve Johnson 2-0 at 2019 ATP Mexican Open

Stan Wawrinka of Switzerland serves during the men's singles second round match between Stan Wawrinka of Switzerland and Steve Johnson of the United States at the 2019 ATP Mexican Open tennis tournament in Acapulco, Mexico, on Feb. 27, 2019. Stan Wawrinka won 2-0. (Xinhua/Xin Yuewei)