COCO GAUFF has shockingly fired her coach just days before the start of the US Open.

The two-time Grand Slam winner has been working with Matt Daly and J.C. Faurel.

She stormed to French Open success with the duo just months ago.

However, she has now decided to part ways with Daly.

"Only have good things to say about Coco, enjoyed working with her," he said.

World No3 Gauff has replaced him with biomechanics expert Gavin MacMillan.

She has struggled with her serve since the first-round defeat at Wimbledon last month.

And the 21-year-old American has now unexpectedly chosen to make a change ahead of the US Open .

It's just days before the tournament at Flushing Meadows starts with the singles bracket beginning on Sunday.

MacMillan has worked with world No1 Aryna Sabalenka i

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