MASON, OHIO - AUGUST 13: Gael Monfils of France returns a shot to Frances Tiafoe of the United States during Day 4 of the Western and Southern Open at Lindner Family Tennis Center on August 13, 2019 in Mason, Ohio. (Photo by Rob Carr/Getty Images)
MASON, OHIO - AUGUST 13: Gael Monfils of France returns a shot to Frances Tiafoe of the United States during Day 4 of the Western and Southern Open at Lindner Family Tennis Center on August 13, 2019 in Mason, Ohio. (Photo by Rob Carr/Getty Images)