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MELBOURNE, VIC - JANUARY 11: SIMONA HALEP (ROU) and coach DARREN CAHILL during a practice session on January 11, 2018 leading up to the 2018 Australian Open at Melbourne Park Tennis Centre Melbourne, Australia. (Photo by Chaz Niell/Icon Sportswire via Getty Images)

MELBOURNE, VIC - JANUARY 11: SIMONA HALEP (ROU) and coach DARREN CAHILL during a practice session on January 11, 2018 leading up to the 2018 Australian Open at Melbourne Park Tennis Centre Melbourne, Australia. (Photo by Chaz Niell/Icon Sportswire via Getty Images)