KEY BISCAYNE, FL - MARCH 22: Stefanos Tsitsipas of Greece returns a shot to Daniil Medvedev of Russia during Day 4 of the Miami Open at the Crandon Park Tennis Center on March 22, 2018 in Key Biscayne, Florida. (Photo by Matthew Stockman/Getty Images)
MELBOURNE, AUSTRALIA - JANUARY 11: Yosuke Watanuki of Japan plays a forehand in his match against Prajnesh Gunneswaran of India during Qualifying ahead of the 2019 Australian Open at Melbourne Park on January 11, 2019 in Melbourne, Australia. (Photo by Graham Denholm/Getty Images)
