see more

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