Roger Federer Predicts Winner of Novak Djokovic vs. Jannik Sinner Wimbledon Match originally appeared on Athlon Sports.

While Sinner has the upper-hand on hard and clay, he has never defeated Djokovic on grass. And we have already seen the world No 1 on the receiving end of an almighty reprieve this year, given his two-set deficit to Grigor Dimitrov in the fourth round, before the Bulgarian had to agonisingly retire.