Coco Gauff shrugged off her early round struggles to move into the last 16 of the US Open on Saturday with a straight-sets victory over Poland's Magdalena Frech.

Gauff, who had been reduced to tears during a laboured win over Donna Vekic on Thursday, produced her best performance of the tournament to down 28th seed Frech 6-3, 6-1 in one hour 13 minutes.

The American third seed's preparations for the US Open were thrown into turmoil when she took the decision to shake up her coaching team in an effort to improve her service game, just days before competition got under way.

While her serve remained a problem in the opening rounds, Gauff got it working smoothly in Saturday's match on the Arthur Ashe Stadium court.

She conceded just two break points during the entire match, and was broken

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