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BELGRADE, SERBIA - MAY 24: Alex Molcan of Slovakia returns a ball during his men's singles first round match against Hamad Medjedovic of Serbia on Day 2 of the ATP 250 Belgrade Open at Novak Tennis Centre on May 24, 2021 in Belgrade, Serbia. (Photo by Srdjan Stevanovic/Getty Images)

BELGRADE, SERBIA - MAY 24: Alex Molcan of Slovakia returns a ball during his men's singles first round match against Hamad Medjedovic of Serbia on Day 2 of the ATP 250 Belgrade Open at Novak Tennis Centre on May 24, 2021 in Belgrade, Serbia. (Photo by Srdjan Stevanovic/Getty Images)