Coco Gauff breezes through at Australian Open after Roddick tune-up

American Coco Gauff says working with Andy Roddick on her serve was ‘really cool’ after she won her first-round Australian Open match. Photograph: Andy Cheung/Getty Images

Coco Gauff has revealed that she worked with Andy Roddick, the last man from the US to win a singles grand slam title, during the off-season to reconfigure her service motion as she looks to build on last year’s US Open triumph and compete for more major titles.

“It was really cool,” Gauff said. “He’s a really chill guy. I met him before but never to that level. I went to Charlotte for two days. It was a really good two days. I think that my serve has improved. I think I just need to continue to trust it and trust all the work that I did in the off-season.”