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Stan Wawrinka of Switzerland serves 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 serves 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)