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SINGAPORE - FEBRUARY 22: Michael Mmoh of the United States plays a backhand in his Men's Singles first round match against Yoshihito Nishioka of Japan on day one of the Singapore Tennis Open at the OCBC Arena on February 22, 2021 in Singapore. (Photo by Paul Miller/Getty Images for Sport Singapore)

SINGAPORE - FEBRUARY 22: Michael Mmoh of the United States plays a backhand in his Men's Singles first round match against Yoshihito Nishioka of Japan on day one of the Singapore Tennis Open at the OCBC Arena on February 22, 2021 in Singapore. (Photo by Paul Miller/Getty Images for Sport Singapore)