Jannik Sinner, the world number one, has withdrawn from the U.S. Open after sustaining a right knee injury. The Italian, who won Wimbledon earlier this year, confirmed his absence from the tournament, which runs from August 30 to September 13. Sinner, who had been expected to challenge Carlos Alcaraz, announced his decision following a period of treatment with his medical team.

Alcaraz, who had been sidelined due to a wrist injury, has confirmed his participation in the U.S. Open. The Spanish player, who defeated Sinner in last year’s final, will make his return to competitive play in New York. Sinner’s withdrawal leaves Alcaraz without his main rival in the final stretch of the tennis season.

The news comes just a day after Alcaraz announced his return to the court. Sinner, who has not competed since Wimbledon, expressed disappointment over his inability to participate in the event. His absence marks the end of a highly anticipated rivalry in the tennis world.

The U.S. Open will proceed without Sinner, as he continues his recovery. Alcaraz will now face the challenge of defending his title without his primary competitor.