US Open 2025, Aug. 19 -- World number one Jannik Sinner has withdrawn from the mixed doubles event at the US Open 2025, where he had been due to partner Czech player Katerina Siniakova. The decision comes just a day after illness forced Sinner to retire from the Cincinnati Open final against Carlos Alcaraz, five games into the opening set.

Sinner and Siniakova will be replaced by Americans Danielle Collins and Christian Harrison.

The reigning Australian Open, Wimbledon and US Open champion appeared visibly unwell in sweltering conditions on Monday, trailing 5-0 in the first set before conceding the match. His retirement handed Alcaraz another significant victory in what has already been a standout season for the Spaniard.

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