MELBOURNE, AUSTRALIA - JANUARY 13: Tennis balls inside an Australian Open logo sign ahead of day one of the Australian Open at Melbourne Park on January 13, 2019 in Melbourne, Australia. (Photo by James D. Morgan/Getty Images)
MELBOURNE, AUSTRALIA - JANUARY 13: Tennis balls inside an Australian Open logo sign ahead of day one of the Australian Open at Melbourne Park on January 13, 2019 in Melbourne, Australia. (Photo by James D. Morgan/Getty Images)