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ACAPULCO, MEXICO - FEBRUARY 28: Nick Kyrgios of Australia serves during the quarterfinals match between Nick Kyrgios of Australia and Stan Wawrinka of Switzerland as part of the day 4 of the Telcel Mexican Open 2019 at Mextenis Stadium on February 28, 2019 in Acapulco, Mexico. (Photo by Hector Vivas/Getty Images)

ACAPULCO, MEXICO - FEBRUARY 28: Nick Kyrgios of Australia serves during the quarterfinals match between Nick Kyrgios of Australia and Stan Wawrinka of Switzerland as part of the day 4 of the Telcel Mexican Open 2019 at Mextenis Stadium on February 28, 2019 in Acapulco, Mexico. (Photo by Hector Vivas/Getty Images)