DALLAS, TX - FEBRUARY 03: Kei Nishikori (JPN) hits a forehand during the RBC Tennis Championships of Dallas on February 3, 2018 at the T Bar M Racquet Club in Dallas, Texas. (Photo by George Walker/Icon Sportswire via Getty Images)
DALLAS, TX - FEBRUARY 03: Kei Nishikori (JPN) hits a forehand during the RBC Tennis Championships of Dallas on February 3, 2018 at the T Bar M Racquet Club in Dallas, Texas. (Photo by George Walker/Icon Sportswire via Getty Images)