Sure, Naomi Osaka is a four-time Grand Slam champion who also impresses with her fashionable outfits.But on Wednesday morning (AEST), she sounded like the rest of us. The plantar fasciitis was acting up. 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.Osaka and Muchova hug after their Wimbledon quarterfinal clash. (Getty Images: Shi Tang)"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. But I think I probably won't do that again. But yeah, I would say it was like an accumulation of playing two weeks straight without a day off."In a Wimbledon warm-up tournament in Bad Homburg, Germany, Osaka had retired from the final — against Muchova — because of a foot injury.The Japanese player — who took mental-health breaks starting in 2021 and was away from the tour while having a daughter — was asked if she had an ankle issue.No, she responded before joking about "getting old".She did say, however, that she has "plantar fasciitis on my feet. Well, that's what we assume it is"."It kind of started happening off-season last year," Osaka said."I feel like maybe it's because I'm a lot more springy on my toes. I think it reactivated on grass court because I'm pushing off a lot more to go forward. I don't think it will bother me on hard court. 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.Gauff beats Pegula in three setsThere'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.Coco Gauff reacts after beatuing fellow American Jessica Pegula at Wimbledon. (Getty Images: Shi Tang)"I've been going three sets almost every match. I feel like when you have that faith in yourself as a competitor, when the match goes a distance, you know when you lose one set, you're not panicking," Gauff said.With the victory, the 22-year-old Gauff became the youngest player to reach the semifinals at all four grand slams since Maria Sharapova, who completed the feat at the 2007 French Open, the women's professional tennis tour said.In Gauff's six previous appearances at the All England Club, she had never gotten past the fourth round. But perhaps experience at the grass-court major is starting to pay off."I think after seven years playing this tournament it's finally the first time I can walk on Centre Court and I didn't feel nervous," she said. "So I don't know if I'm becoming a vet."The "vet" was undone by early double-faults, though, putting herself in a hole to start the match. She led 40-0 right away but lost the next five points — including two on double-faults — to go down 1-0. After breaking Pegula in the sixth game, Gauff was immediately broken to love with two more double-faults.Gauff called the last two sets "really great tennis.""Jess' ball is so flat and low. So I think I just needed to address that … be in there in the rallies and just play the tennis that I wanted to play. And I think I started to land more first serves in the court," Gauff said."So I think that also helped and just trusting my shots."Email addressAP