Former champion Naomi Osaka reached the fourth round of the US Open for the first time in five years on Saturday with a three-set victory over Australian 15th seed Daria Kasatkina.

Osaka, who last reached the fourth round at Flushing Meadows during her run to the title in 2020, took advantage of Kasatkina's shaky serve to advance 6-0, 4-6, 6-3 on the Louis Armstrong Stadium court.

The win marks Osaka's best performance in a Grand Slam singles tournament since she returned to tennis last year following the birth of her daughter in 2023 -- and sets up a blockbuster fourth round clash with American third seed Coco Gauff.

"It's been a really long journey but I'm glad to be here now," Osaka said, as she looked ahead to playing in the second week of a Grand Slam for the first time since winni

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