World number one Jannik Sinner, who was forced to retire during the final of the Cincinnati Open, and playing partner Katerina Siniakova have withdrawn from the US Open mixed doubles draw,

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.