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MIAMI GARDENS, FLORIDA - MARCH 28: Dennis Shapovalov of Canada hits a backhand against Frances Tiafoe of the United States in the quarter finals of the men's singles at the Hard Rock Stadium on March 28, 2019 in Miami Gardens, Florida. (Photo by TPN/Getty Images)

MIAMI GARDENS, FLORIDA - MARCH 28: Dennis Shapovalov of Canada hits a backhand against Frances Tiafoe of the United States in the quarter finals of the men's singles at the Hard Rock Stadium on March 28, 2019 in Miami Gardens, Florida. (Photo by TPN/Getty Images)