Day 4 of the 2025 U.S. Open tennis tournament in Flushing Meadows, New York featured second round singles matches.

says he is trying to solve riddles in his game at the U.S. Open. Even after dropping an opening set on Wednesday, Djokovic progressed to the third round. He improved to 36-0 across the first and second rounds in New York, a place he’s won four championships, by coming back to beat 145th-ranked American qualifier Zachary Svajda 6-7 (5), 6-3, 6-3, 6-1 at Arthur Ashe Stadium. This was Djokovic's first tournament anywhere since losing to Jannik Sinner in the Wimbledon semifinals last month. Winners included both of last year’s runners-up — Jessica Pegula and Taylor Fritz — and 2021 champion Emma Raducanu. No. 12 seed Casper Ruud, the 2022 runner-up, lost to Raphael Collignon.

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