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TURIN, ITALY - NOVEMBER 15: Stefanos Tsitsipas of Greece plays a forehand during the Round Robin Green Group singles match against Andrey Rublev of Russia on Day Two of the Nitto ATP World Tour Finals at Pala Alpitour on November 15, 2021 in Turin, Italy. (Photo by Giampiero Sposito/Getty Images)

TURIN, ITALY - NOVEMBER 15: Stefanos Tsitsipas of Greece plays a forehand during the Round Robin Green Group singles match against Andrey Rublev of Russia on Day Two of the Nitto ATP World Tour Finals at Pala Alpitour on November 15, 2021 in Turin, Italy. (Photo by Giampiero Sposito/Getty Images)