Top seeds Jannik Sinner and Iga Swiatek have advanced to the fourth round of the US Open, with Sinner defeating Christopher O’Connell and Swiatek overcoming Anastasia Pavlyuchenkova. Sinner highlighted the unpredictability of tennis, noting the recent upsets of Novak Djokovic and Carlos Alcaraz. Swiatek, aiming for her sixth Grand Slam title, received a boost from a pep talk by Serena Williams and will face Liudmila Samsonova next. American hopefuls Tommy Paul and Jessica Pegula also progressed, with Paul set to challenge Sinner. Despite recent struggles, Swiatek showed a return to form with dominant performances in her recent matches.