Coco Gauff has made improvements to her serving and her forehand. And the strides in both of those areas are among the reasons she's considered one of the few women ready to challenge two-time defending champion Aryna Sabalenka for the title at the Australian Open.

Coco Gauff of the U.S. reacts after winning a point against Jodie Burrage of Britain during their second round match at the Australian Open tennis championship in Melbourne, Austr