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Stan Wawrinka of Switzerland returns the ball during the singles semifinal match against Corentin Moutet of France at ATP Qatar Open tennis tournament in Doha, Qatar, Jan. 10, 2020. (Photo by Nikku/Xinhua)

Stan Wawrinka of Switzerland returns the ball during the singles semifinal match against Corentin Moutet of France at ATP Qatar Open tennis tournament in Doha, Qatar, Jan. 10, 2020. (Photo by Nikku/Xinhua)