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ACAPULCO, MEXICO - FEBRUARY 23: Denis Kudla of USA returns a ball during a singles match between Grigor Dimitrov of Bulgary and Denis Kudla of USA as part of Telcel ATP Mexican Open 2016 at Mextenis Stadium on February 23, 2016 in Acapulco, Mexico. (Photo by Hector Vivas/LatinContent via Getty Images)

ACAPULCO, MEXICO - FEBRUARY 23:  Denis Kudla of USA returns a ball during a  singles match between Grigor Dimitrov of Bulgary and Denis Kudla of USA as part of Telcel ATP Mexican Open 2016 at Mextenis Stadium on February 23, 2016 in Acapulco, Mexico. (Photo by Hector Vivas/LatinContent via Getty Images)