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MEMPHIS, TN - FEBRUARY 13: Kei Nishikori of Japan reacts to a shot during his semi-final singles match against Sam Querrey of the United States on Day 6 of the Memphis Openat the Racquet Club of Memphis on February 13, 2016 in Memphis, Tennessee. (Photo by Stacy Revere/Getty Images)

MEMPHIS, TN - FEBRUARY 13:  Kei Nishikori of Japan reacts to a shot during his semi-final singles match against Sam Querrey of the United States on Day 6 of the Memphis Openat the Racquet Club of Memphis on February 13, 2016 in Memphis, Tennessee.  (Photo by Stacy Revere/Getty Images)