MASON, OH - AUGUST 17: Stan Wawrinka of Switzerland hits a return to Jared Donaldson of the United States on Day 5 of the Western & Southern Open at the Lindner Family Tennis Center on August 17, 2016 in Mason, Ohio. Wawrinka defeated Donaldson 2-6, 6-3, 6-4. (Photo by Joe Robbins/Getty Images)
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