As Jannik Sinner pursues a fourth Grand Slam, he'll have somewhat of a physical limitation at Wimbledon. The Italian tennis star and world No. 1 is wearing a sleeve over his right arm for his quarterfinals matchup against Ben Shelton, a result of an injury he sustained in the last round.

Every other day at Wimbledon has brought an opportunity to compare the greatest player in men's tennis and one of his heirs.

The Serbian legend has played excellent tennis up to this point in the tournament and has reacted like a true champion to all the difficulties – especially in the matches against Alex de Minaur and Flavio Cobolli – but he is aware that he will literally have to climb a mountain on Friday.