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DUBAI, UNITED ARAB EMIRATES - FEBRUARY 28: Hubert Hurkacz of Poland in action against Stefanos Tsitsipas of Greece during day twelve of the ATP Dubai Duty Free Tennis Championships at Dubai Duty Free Tennis Stadium on February 28, 2019 in Dubai, United Arab Emirates. (Photo by Francois Nel/Getty Images)

DUBAI, UNITED ARAB EMIRATES - FEBRUARY 28:  Hubert Hurkacz  of Poland in action against Stefanos Tsitsipas of Greece during day twelve of the ATP Dubai Duty Free Tennis Championships at Dubai Duty Free Tennis Stadium on February 28, 2019 in Dubai, United Arab Emirates. (Photo by Francois Nel/Getty Images)