She's working too much."I'm just getting old," Osaka said.The 28-year-old Osaka's Wimbledon run and fashion show ended in a 7-6 (7-4), 6-4 loss to Karolina Muchova in the quarterfinals of the grass court grand slam.Osaka, a former number one player, had ousted top-ranked Aryna Sabalenka in the fourth round — with arguably some of her best tennis since returning from maternity leave — but couldn't find her rhythm against her Czech opponent."It's hard because I played so well in my last match, then today I just feel like I didn't play well at all and I didn't have any energy," said Osaka, who, despite the loss, still had her best result at the All England Club by reaching the quarterfinals."I could feel it coming because I've played way more matches than I usually do before a slam."I just wanted to try that to see the rhythm, you know? Obviously, it worked out well I'm thinking it was maybe just the surface change."Osaka has won two of her four major titles (2018 and 2020) at the US Open, and she made it back to the semifinals at Flushing Meadows last year, losing to Amanda Anisimova."I feel like in my head I think there's still an opportunity to win a slam," she said.There's no panic in Coco Gauff.Down a set after untimely double-faults, Gauff rallied past Jessica Pegula 4-6, 6-3, 6-3 to reach the Wimbledon semifinals for the first time, setting up a clash with Muchova.The two-time major champion raised her arms in the air after Pegula sent a weak backhand into the net on the first match point in an all-American quarterfinal on Centre Court."I've been going three sets almost every match