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INDIAN WELLS, CALIFORNIA - MARCH 12: Roger Federer of Switzerland hits a backhand against Stan Wawrinka of Switzerland on March 12, 2019, in the third round of the BNP Paribas Open at Indian Wells Tennis Garden in Indian Wells, California. (Photo by TPN/Getty Images)

INDIAN WELLS, CALIFORNIA - MARCH 12: Roger Federer of Switzerland hits a backhand against Stan Wawrinka of Switzerland on March 12, 2019, in the third round of the BNP Paribas Open at Indian Wells Tennis Garden  in Indian Wells, California. (Photo by TPN/Getty Images)