Jannik Sinner has withdrawn from the U.S. Open mixed doubles event, where he was going to partner Katerina Siniakova, a day after illness forced the world number one to retire five games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

As was expected, world no. 1 Jannik Sinner will not compete in today's US Open mixed doubles event. The Italian retired against Carlos Alcaraz while trailing 5-0 in Monday's Cincinnati Masters final.

Grand Slam singles champions such as Jannik Sinner, Carlos Alcaraz, Iga Swiatek and Madison Keys will be playing for a little extra money — OK, a lot of extra money, by any standard: $1 million to the winning duo — and trying to get their hands on a trophy in the U.S. Open’s overhauled mixed doubles tournament.

When it came to finding a partner for the newly formatted mixed doubles event at this year’s U.S. Open, it seemed like a no-brainer for Madison Keys.

Emma Navarro withdrew from the mixed doubles championship at the U.S. Open, but Katerina Siniakova will replace her and partner with Jannik Sinner.