Novak Djokovic of Serbia returns the ball to Miomir Kecmanovic of Serbia during their ATP 250 Serbia Open quarter final singles tennis match in Belgrade, Serbia on April 23, 2021.//MILOSAVLJEVIC_1911.17624/2104241153/Credit:Pedja Milosavljevic/SIPA/2104241158,Image: 607603138, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Profimedia