Tennis News: Defending Champion Sinner Opens US Open Fourth Round on September 1, 2025

Defending men’s singles champion Jannik Sinner returned to Arthur Ashe Stadium on Monday evening to contest his 2025 US Open fourth-round match against Alexander Bublik, aiming to extend his title defence into the quarter-finals. The world No 1, renowned for his powerful baseline game and iron-clad mental resilience, took to the court just after 7 p.m. Eastern, kicking off the night session in front of a capacity crowd.

Despite Bublik’s reputation for unpredictability-having claimed a grass-court victory over Sinner earlier this season-Sinner seized the early momentum. Two unreturned serves and a forced error from Bublik yielded an immediate break, handing the Italian a 1-0 lead. Sinner consolidated his advantage with a clinical service game to move 2-0 ahead, then pressured Bublik’s serve again to race to a 3-0 advantage in the opening set.

The Italian’s relentless depth and precision from the backcourt stifled Bublik’s shot-making creativity, while also drawing three double faults from the Kazakhstani opponent. Sinner’s commanding start underscored his bid to become the first man since Roger Federer to successfully defend a US Open crown.

Coverage continues through Tuesday’s play, with Sinner needing two more sets to secure a return to the last eight and preserve his hopes of retaining the championship.