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HONOLULU, HI - DECEMBER 26: Christian Harrison of the United States hits a forehand during the first round match of the Hawaii Tennis Open against Brandon Nakashima of the United States at the Stan Sheriff Center on December 26, 2019 in Honolulu, Hawaii. (Photo by Darryl Oumi/Getty Images)

HONOLULU, HI - DECEMBER 26: Christian Harrison of the United States hits a forehand during the first round match of the Hawaii Tennis Open against Brandon Nakashima of the United States at the Stan Sheriff Center on December 26, 2019 in Honolulu, Hawaii.  (Photo by Darryl Oumi/Getty Images)