Osaka relentlessly targeted Gauff's weak forehand to send the home favorite out of the tournament.

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