MASON, OHIO - AUGUST 14: Miomir Kecmanovic of Serbia serves to Alexander Zverev of Germany during the Western & Southern Open at Lindner Family Tennis Center on August 14, 2019 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)
MASON, OHIO - AUGUST 14: Miomir Kecmanovic of Serbia serves to Alexander Zverev of Germany during the Western & Southern Open at Lindner Family Tennis Center on August 14, 2019 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)