In beating 15th seed Kasatkina, Osaka has reached the fourth round of a Grand Slam for the first time since winning the Australian Open title in 2021.There, she will reunite with Gauff, who she described as her “little sister”.Their first of five previous meetings came at Flushing Meadows in 2019, when Osaka defeated a 15-year-old Gauff in the third round.Osaka, 27, powered to a first set bagel in 22 minutes against Kasatkina, who committed eight double faults and landed just 25% of her first serves.Yet Kasatkina, who switched her allegiance from Russia to Australia earlier this year, forced a decider after a scrappy second set featuring seven service breaks as Osaka looked increasingly frustrated.Osaka regained her composure and saved a break point before closing out the set in relative comfort.”Honestly, I was trying to tell myself to stay calm. I was so shaky today but I’m glad that it was an entertaining match,” Osaka said.”Whenever I come here it feels like home and you guys are very involved and I feel grateful, thank you.”When asked about facing home hopeful Gauff in the next round, she said: “Can someone come to the match and cheer for me?”It’s tough playing an American here but I hope you guys have adopted me. I kind of see her as a little sister so it’s cool to be playing her here.”Meanwhile, 27th seed Marta Kostyuk fought back from a set down to beat world number 107 Diane Parry of France 3-6 6-4 6-2.The Ukrainian will face 13th seed Karolina Muchova of the Czech Republic, who also came from behind to defeat compatriot Linda Noskova 6-7 (5-7) 6-4 6-2.
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US Open 2025 results: Coco Gauff reaches fourth round after ’emotional week’

