Coco Gauff is through to round four of the US Open. This marks her 16th grand slam fourth round appearance. Her age? 21 years. Gauff stormed into the fourth round after a breezy straight sets victory against #28 seed Magdalena Frech with a scoreline of 6-3, 6-1 at the Arthur Ashe Stadium. Gauff’s journey in the tournament so far has been a rollercoaster. Just six days after biomechanist Gavin MacMillan hopped on board the coaching team of Gauff, she entered the hard court major with little training and a boatload of serving woes.

While MacMillan’s presence boosted Gauff’s morale, she still struggled in her first round against Aussie Ajla Tomljanović with her new service motion in what she described as a ‘high pressure situation’ for experimentation. Gauff, though still trudging through

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