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MIAMI GARDENS, FLORIDA - MARCH 31: Roger Federer of Switzerland hits a backhand against John Isner of the United States in the men's singles final of the Miami Open at the Hard Rock Stadium on March 31, 2019 in Miami Gardens, Florida. (Photo by TPN/Getty Images)

MIAMI GARDENS, FLORIDA - MARCH 31: Roger Federer of Switzerland hits a backhand against John Isner of the United States  in the men's singles final of the Miami Open at the Hard Rock Stadium on March 31, 2019 in Miami Gardens, Florida. (Photo by TPN/Getty Images)