Coco Gauff scrapes through to US Open second round

Coco Gauff shouts after beating Ajla Tomljanovic. Pic: Frank Franklin II/AP

Coco Gauff battled through more serving problems to scrape into the second round of the US Open.

The French Open champion changed her coaching team on the eve of the tournament, adding biomechanics expert Gavin MacMillan in an effort to fix her serving issues.