The No. 1-ranked Sinner, the defending champion in singles at Flushing Meadows, was supposed to compete in mixed doubles with Katerina Siniakova.

It was clear immediately that Jannik Sinner was not himself in Cincinnati.

Jannik Sinner has been the man to watch this summer, riding a scorching win streak as he heads into the Cincinnati Open semifinals. On Saturday, he’ll face French breakout star Terence Atmane with a spot in the final — and a 26th straight hard-court victory — on the line.

Nathan, a co-founder of the sports website Defector Media, has published “ Changeover: A Young Rivalry and a New Era of Men’s Tennis ” with Gallery Books. He spent the 2024 season squarely focused on Sinner and Alcaraz, in which they split the four majors and accelerated their ascension into a tennis stratosphere of their own creation.

Jannik Sinner has withdrawn from the U.S. Open mixed doubles event, where he was going to partner Katerina Siniakova, a day after illness forced the world number one to retire five games into his Cincinnati Open final.

Jannik Sinner se retiró del torneo de dobles mixtos del Abierto de Estados Unidos el martes poco antes de que comenzara, un día después de que abandonó

No one will be getting an early glimpse at the men’s world No.1 singles player in Flushing this year, nor an 11-time Grand Slam doubles champion.

Afterward, Sinner didn't have a traditional press conference. Instead, he was asked a couple of questions by the ATP media and provided answers. One of the things asked was if there was anything specific he wanted to work on going into the US Open.