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MIAMI GARDENS, FLORIDA - MARCH 28: Frances Tiafoe of the United States hits a forehand against Dennis Shapovalov of Canada 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: Frances Tiafoe of the United States hits a forehand against Dennis Shapovalov of Canada 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)