Naomi Osaka was eliminated from the U.S. Open in the second round by Karolina Muchova, losing in straight sets, 6-3, 7-6(5). Despite a strong opening-round performance, Osaka struggled with 21 unforced errors, including a critical double fault and multiple forehand errors in key moments. After leading 5-4 in the second set, she was unable to sustain her momentum, eventually losing in a tiebreak. Muchova, benefiting from strong serving and athletic play, capitalized on Osaka's mistakes to secure the victory. Osaka, once ranked No. 1 and now No. 88, was making her first U.S. Open appearance since giving birth and taking a break for mental health reasons. Muchova, a 2023 French Open runner-up, continues to gain momentum as she advances to the third round.