After Emma Navarro's withdrawal, Jannik Sinner will make his US Open mixed doubles debut alongside one of the most decorated doubles player of the last decade. World no. 1 will join forces with Katerina Siniakova.

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.