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PERTH, AUSTRALIA - DECEMBER 30: Roger Federer of Switzerland gestures to the spectators before hitting signed tennis balls into the stands during day two of the 2019 Hopman Cup at RAC Arena on December 30, 2018 in Perth, Australia. (Photo by Paul Kane/Getty Images)

PERTH, AUSTRALIA - DECEMBER 30: Roger Federer of Switzerland gestures to the spectators before hitting signed tennis balls into the stands during day two of the 2019 Hopman Cup at RAC Arena on December 30, 2018 in Perth, Australia. (Photo by Paul Kane/Getty Images)