MASON, OH - AUGUST 14: Roger Federer of Switzerland returns a shot to Peter Gojowczyk of Germany during Day 4 of the Western and Southern Open at the Lindner Family Tennis Center on August 14, 2018 in Mason, Ohio. (Photo by Rob Carr/Getty Images)
MASON, OH - AUGUST 14: Roger Federer of Switzerland returns a shot to Peter Gojowczyk of Germany during Day 4 of the Western and Southern Open at the Lindner Family Tennis Center on August 14, 2018 in Mason, Ohio. (Photo by Rob Carr/Getty Images)