Djokovic, ranked No. 6 in the world, is bidding to win a record 25th major at the U.S. Open, which begins Aug. 24. He lost to world No. 1 Jannik Sinner in the semifinals at both Roland Garros and Wimbledon. The Cincinnati Open is still headlined by Sinner and Alcaraz, with many other top stars playing.

Grand Slam champion Novak Djokovic won't be taking part in the Cincinnati Open, meaning that he won't have any warmup matches on hard-courts before the US Open.