Naomi Osaka overcame Elise Mertens 6-3 3-6 7-5 on Louis Armstrong Stadium to reach the US Open fourth round. The 28-year-old two-time champion wore a distinctive grey checked blazer-hoodie and wide-leg pants, blending boardroom and locker-room aesthetics. After dropping the second set and trailing in the decider, Osaka recovered following a medical timeout, firing a decisive ace at 6-5 before closing out the match. She will face second seed Elena Rybakina or Yuliia Starodubtseva next. Osaka admitted she "didn't play amazing" and apologized for throwing her racket, telling the crowd, "I'm shocked I won."

Meanwhile, 18-year-old American Iva Jovic put friendship aside to defeat Alexandra Eala of the Philippines 7-5 3-6 7-5 in a three-hour thriller on Arthur Ashe Stadium. The close friends had previously played doubles together during Fan Week with their fathers. Jovic edged a tight opening set before Eala leveled the match. In the decider, Jovic prevailed to secure her spot in the fourth round at Flushing Meadows.