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ACAPULCO, MEXICO - FEBRUARY 27: Stan Wawrinka of Switzerland returns a ball during the singles match between Stan Wawrinka of Switzerland and Grigor Dimitrov of Bulgaria as part of the ATP Mexican Open 2020 Day 4 on February 27, 2020 in Acapulco, Mexico. (Photo by Regina Cortina/Jam Media/Getty Images)

ACAPULCO, MEXICO - FEBRUARY 27: Stan Wawrinka of Switzerland returns a ball during the singles match between Stan Wawrinka of Switzerland and Grigor Dimitrov of Bulgaria as part of the ATP Mexican Open 2020 Day 4 on February 27, 2020 in Acapulco, Mexico. (Photo by Regina Cortina/Jam Media/Getty Images)