“I was super locked-in, to be honest. I was really locked in,” said Osaka, a 27-year-old who was born in Japan and moved to the U.S. with her family at age 3.

Naomi Osaka stunned third seed Coco Gauff 6-3, 6-2 in a highly anticipated fourth-round showdown between two former U.S. Open champions on Monday (September 1, 2025).