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MEMPHIS, TN - FEBRUARY 10: Kei Nishikori of Japan reacts to a shot during his singles match against Ryan Harrison of the United States on Day 3 of the Memphis Open at the Racquet Club of Memphis on February 10, 2016 in Memphis, Tennessee. (Photo by Stacy Revere/Getty Images)

MEMPHIS, TN - FEBRUARY 10:  Kei Nishikori of Japan reacts to a shot during his singles match against Ryan Harrison of the United States on Day 3 of the Memphis Open at the Racquet Club of Memphis on February 10, 2016 in Memphis, Tennessee.  (Photo by Stacy Revere/Getty Images)