World No. 1 Jannik Sinner has withdrawn from the Cincinnati Open, raising concerns about his availability for the upcoming US Open.

Context

Sinner's withdrawal follows that of defending champion Carlos Alcaraz, who also will not participate in the Cincinnati Open, a key warmup event for the US Open.S1S2

Key points

• Sinner's withdrawal puts his participation in the US Open into question.S1

• Carlos Alcaraz, the world No. 2, has also pulled out of the Cincinnati Open.S2S3

• The Cincinnati Open is considered an important preparatory tournament for the US Open.S1

• Both players' absences may impact their readiness for the US Open.S1

• Sinner's current ranking as world No. 1 adds significance to his withdrawal.S2

• Alcaraz was the defending champion at the Cincinnati Open.S2

• The withdrawals of top players could affect fan interest in the tournament.S1

• The Cincinnati Open serves as a critical test for players ahead of the US Open.S1

Why it matters

• The absence of top-ranked players like Sinner and Alcaraz may alter the competitive landscape of the US Open.S1

• Fans and analysts are concerned about the implications for Sinner's performance in major tournaments.S2

What to watch

• Monitor updates on Sinner's condition and potential participation in the US Open.S1

• Watch for announcements regarding other players' withdrawals or injuries leading up to the US Open.S2