Coco Gauff has made a change to her coaching staff just before the US Open, parting ways with her coach Matt Daly and adding biomechanics expert Gavin MacMillan to her team. The two-time Grand Slam champion recently lost the world No. 2 ranking and has seen a downturn in her results since winning the Roland Garros title in early June.

The American was having a great run during the clay-court swing, reaching the finals in Madrid and Rome and winning her second major title in Paris. However, the results have not been with her since then: two consecutive first-round losses in Berlin and Wimbledon left her with a poor showing on grass.

With the start of the American hardcourt swing, it seemed Gauff could bounce back in her favorite part of the year, but she only reached the Round of 16 in Mo

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