World No. 1 Jannik Sinner withdrew from the Cincinnati Open on Sunday, Aug. 10, because of a right knee injury [1], [2].

The withdrawal of the top-ranked player disrupts the tournament draw and raises questions about Sinner's readiness for the upcoming hard-court season. As the current leader of the men's rankings [1], his absence removes a primary title contender from one of the most prestigious events in the U.S.

Sinner announced the decision after experiencing issues with his right knee [4]. The injury required medical attention and a period of rest to prevent further damage. The Cincinnati Open, also known as the Cincinnati Masters, serves as a critical preparation event for players before they head to the U.S. Open.

In a statement regarding the decision, Sinner noted the collaborative nature of the medical process. "I consulted with my doctors and my team," Sinner said [2].

The right knee injury [4] prevents the Italian star from competing in Ohio this week. While the exact severity of the injury was not detailed in the announcement, the decision to withdraw indicates a need for immediate recovery. Sinner has maintained the No. 1 ranking [1] through a dominant season, making any physical setback a point of concern for his supporters and competitors alike.

Tournament officials in Cincinnati have not yet announced who will replace Sinner in the bracket. The event continues to proceed with a modified schedule as other top seeds prepare for their opening matches. Sinner's team is expected to provide updates on his recovery progress as the window for the next Grand Slam approaches.

“World No. 1 Jannik Sinner withdrew from the Cincinnati Open on Sunday, Aug. 10, because of a right knee injury.”

Sinner's withdrawal creates a power vacuum in the Cincinnati Open, potentially opening the path for other top seeds to secure a title. More importantly, the timing of a knee injury just weeks before the U.S. Open puts his ability to defend or challenge for a major title at risk, as knee stability is critical for the movement required on hard courts.