Two-time U.S. Open champion Naomi Osaka crashed out in the second round at Flushing Meadows with a 6-3, 7-6(5) loss to Czech opponent Karolina Muchova on Thursday. The Japanese former world No. 1, playing the tournament for the first time since taking a break from tennis for mental health reasons and the birth of her daughter, was coming off an impressive straight-sets win over world No. 10 Jelena Ostapenko in the first round. She started positively against Muchova and led 3-2 in the first set before the 2023 semifinalist took control, claiming the next four games and finishing the set with 12…