
Pierre-Hugues Herbert of France serves during the first round match against Jack Sock of the United States at the Rogers Cup tennis tournament in Montreal, Canada, on Aug. 8, 2017. (Xinhua/Andrew Soong)

Pierre-Hugues Herbert of France serves during the first round match against Jack Sock of the United States at the Rogers Cup tennis tournament in Montreal, Canada, on Aug. 8, 2017. (Xinhua/Andrew Soong)