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Australia's Alex de Minaur hits a return during a practice session with Andy Murray of Britain in Brisbane on December 30, 2018, ahead of Brisbane International tennis tournament. (Photo by Saeed Khan / AFP) / -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE -- (Photo credit should read SAEED KHAN/AFP/Getty Images)

Australia's Alex de Minaur hits a return during a practice session with Andy Murray of Britain in Brisbane on December 30, 2018, ahead of Brisbane International tennis tournament. (Photo by Saeed Khan / AFP) / -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE --        (Photo credit should read SAEED KHAN/AFP/Getty Images)