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PARIS, FRANCE - JUNE 02: Stefanos Tsitsipas of Greece serves during his mens singles fourth round match against Stan Wawrinka of Switzerland during Day eight of the 2019 French Open at Roland Garros on June 02, 2019 in Paris, France. (Photo by Adam Pretty/Getty Images)

PARIS, FRANCE - JUNE 02: Stefanos Tsitsipas of Greece serves during his mens singles fourth round match against Stan Wawrinka of Switzerland during Day eight of the 2019 French Open at Roland Garros on June 02, 2019 in Paris, France. (Photo by Adam Pretty/Getty Images)