The No. 23-seeded Osaka was better throughout than No. 3 Gauff, whose repeated mistakes really made the difference in Arthur Ashe Stadium.

American Coco Gauff puts her serving issues behind her as she beats Magdalena Frech in straight sets to reach the US Open fourth round.

Coco Gauff produced her sharpest display of the week, brushing aside Magdalena Frech 6-3, 6-1 to reach the US Open’s last 16 in commanding style