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PARIS, FRANCE - MAY 29: Roger Federer of Switzerland serves against Oscar Otte of Germany in the second round of the men's singles during Day 4 of the 2019 French Open at Roland Garros on May 29, 2019 in Paris, France. (Photo by TPN/Getty Images)

PARIS, FRANCE - MAY 29: Roger Federer of Switzerland serves against Oscar Otte of Germany in the second round of the men's singles during Day 4 of the 2019 French Open at Roland Garros on May 29, 2019 in Paris, France. (Photo by TPN/Getty Images)