No. 1 Jannik Sinner kicked off his US Open title defense by surrendering just four games in a 6-1, 6-1, 6-2 win over Vit Kopriva on Tuesday at Arthur Ashe Stadium. Sinner didn't lose any of his 11 service games and won 83% of his first-serve points,

Sinner had to stop playing in the Cincinnati final against Carlos Alcaraz on Aug. 18 because he was sick, pulled out of the U.S. Open mixed doubles tournament that began the next day and said he

In early June, Jannik Sinner suffered the sort of defeat that could cause years of psychological damage. He squandered three match points in the fourth set of the French Open final, before losing a fifth-set tiebreak to his nearest and only rival at the top of tennis, Carlos Alcaraz.