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DELRAY BEACH, FLORIDA - FEBRUARY 18: John Millman of Australia returns a shot against Grigor Dimitrov of Bulgaria during the Quarterfinals of the Delray Beach Open by Vitacost.com at Delray Beach Tennis Center on February 18, 2022 in Delray Beach, Florida. (Photo by Mark Brown/Getty Images)

DELRAY BEACH, FLORIDA - FEBRUARY 18: John Millman of Australia returns a shot against Grigor Dimitrov of Bulgaria during the Quarterfinals of the Delray Beach Open by Vitacost.com at Delray Beach Tennis Center on February 18, 2022 in Delray Beach, Florida. (Photo by Mark Brown/Getty Images)