Emma Navarro withdrew from the US Open mixed doubles, and Jannik Sinner had to find a partner. Now, he will be playing alongside none other than Katerina Siniakova, the former doubles No.1.

The US Open, the final major tournament of the tennis calendar, is set to begin Monday with qualifying matches.

After Emma Navarro's withdrawal, Jannik Sinner will make his US Open mixed doubles debut alongside one of the most decorated ...