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

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

In a battle of former US Open champions, No. 23 seed Naomi Osaka dispatched No. 3 seed in straight sets to advance to the quarterfinals.

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

Naomi Osaka overpowered Coco Gauff with a dominant 6-3, 6-2 win in the US Open last 16 and will face No 11 seed Karolina Muchova in the quarter-finals

Gauff's serve remodel loomed over her tournament. It might be her forehand, which Naomi Osaka broke down to beat her, that matters more.