Naomi Osaka's return to the US Open ended in the second round on Thursday, but the two time champion said she felt "grateful" as she departed in the wake of a straight-sets loss to Karolina Muchova. "It was really fun," Osaka said after falling 6-3, 7-6 (7/5) to the 52nd-ranked Czech under the lights on Arthur Ashe Stadium. "I felt very grateful that there were so many people cheering. I missed it a lot." Japan's Osaka won the title in 2018 and 2020 but missed last year's edition after the birth of her daughter Shai.