Sinner withdrew midway through the final of the Cincinnati Open 2025

With the score of the first set of the final match at 5-0 in favor of Alcaraz, Sinner had to seek medical attention and then announced his retirement. The Italian player quietly watched his opponent Alcaraz raise the championship after only 23 minutes of play.

The Sun newspaper reported that Sinner admitted to his coach and an official that "he felt unable to move and was about to collapse on the pitch".

The Italian tennis player also apologized to the fans: "I tried to continue but couldn't. I sincerely apologize."

However, it is still unclear what exactly went wrong for Sinner when he withdrew midway through the 2025 Cincinnati Open final.

According to the Daily Mail , the referees declared Sinner unable to continue due to illness rather than injury. This coincided with Sinner saying "he was unwell before the final and thought he would be fine after a night's rest".

But what is noteworthy is that when the medical staff entered the court, they treated Sinner's leg injury. When Alcaraz came to ask about Sinner's condition, the reporters' lenses caught the moment when the Italian tennis player made a gesture to his right leg and said something to his colleague.

However, everyone hopes it is just a normal illness, not an injury because the 2025 US Open is very close.

The Sun suspects that Sinner may have fallen ill due to the harsh weather at the Cincinnati Open 2025. Recently, German tennis player Alexander Zverev also fell ill due to the hot weather after his semi-final match with Alcaraz.

Sinner's withdrawal from the Cincinnati Open final has left his participation in the 2025 US Open in doubt. On the morning of August 20, Sinner will partner Kateřina Siniaková (Czech Republic) in the mixed doubles at the 2025 US Open before playing singles next week.