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MELBOURNE, AUSTRALIA - JANUARY 07: 300 ballkids hold up tennis balls during a practice session ahead of the 2019 Australian Open at Melbourne Park on January 07, 2019 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 07: 300 ballkids hold up tennis balls during a practice session ahead of the 2019 Australian Open at Melbourne Park on January 07, 2019 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)