Jannik Sinner’s rivalry with Carlos Alcaraz has become the defining storyline in men’s tennis. But when it comes to recent hard-court dominance, there is no debate, the Italian stands alone.

There was a time in the 2000s when Roger Federer was undoubtedly the top player in tennis. Before the decade even ended, Federer had already claimed 15 of his 20 Grand Slam titles, which included an ...