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MEXICO CITY, MEXICO - FEBRUARY 23: Ryan Harrison of USA returns a shot during a singles match between Marin Cilic of Croatia and Ryan Harrison of USA as part of Telcel ATP Mexican Open 2016 at Mextenis Stadium on February 23, 2016 in Mexico City, Mexico. (Photo by Hector Vivas/LatinContent/Getty Images)

MEXICO CITY, MEXICO - FEBRUARY 23:  Ryan Harrison of USA returns a shot during a singles match between Marin Cilic of Croatia and Ryan Harrison of USA as part of Telcel ATP Mexican Open 2016 at Mextenis Stadium on February 23, 2016 in Mexico City, Mexico. (Photo by Hector Vivas/LatinContent/Getty Images)