World No. 1 Carlos Alcaraz finished off an exhausted Alexander Zverev 6-3, 6-2, 6-4 on Wednesday to move into the U.S. Open semifinals where he will take on Daniil Medvedev in an intriguing clash featuring the last two champions at Flushing Meadows.

Three-time champion Novak Djokovic and 20-year-old Ben Shelton booked their spots on Tuesday.

There were questions about how prepared Zverev would be to face the energetic Alcaraz after playing the longest match of the tournament — a nearly five-hour, five-set marathon against Jannik Sinner in punishing conditions on Monday.