Highlights of fourth round matches at 2019 US Open

Source: Xinhua| 2019-09-02 08:44:28|Editor: Wu Qin

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(SP)US-NEW YORK-TENNIS-US OPEN-MEN'S SINGLES

Stan Wawrinka of Switzerland hits a return during the men's singles fourth round match between Novak Djokovic of Serbia and Stan Wawrinka of Switzerland at the 2019 US Open tennis championships in New York, the United States, Sept. 1, 2019. Wawrinka advanced into quarterfinals as Djokovic retired. (Xinhua/Li Muzi)