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MELBOURNE, AUSTRALIA - JANUARY 20: Stefanos Tsitsipas of Greece enjoys an emotional celebration after beating Roger Federer of Switzerland during day seven of the 2019 Australian Open at Melbourne Park on January 20, 2019 in Melbourne, Australia. (Photo by TPN/Getty Images)'n'n'n

MELBOURNE, AUSTRALIA - JANUARY 20: Stefanos Tsitsipas of Greece enjoys an emotional celebration after beating Roger Federer of Switzerland during day seven of the 2019 Australian Open at Melbourne Park on January 20, 2019 in Melbourne, Australia. (Photo by TPN/Getty Images)'n'n'n