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MEMPHIS, TN - FEBRUARY 12: Yoshihito Nishioka of Japan serves to Sam Querrey of the United States during their quarterfinal singles match on Day 5 of the Memphis Open at the Racquet Club of Memphis on February 12, 2016 in Memphis, Tennessee. (Photo by Stacy Revere/Getty Images)

MEMPHIS, TN - FEBRUARY 12:  Yoshihito Nishioka of Japan serves to Sam Querrey of the United States during their quarterfinal singles match on Day 5 of the Memphis Open at the Racquet Club of Memphis on February 12, 2016 in Memphis, Tennessee.  (Photo by Stacy Revere/Getty Images)