Out went Gilbert, and in came the development of Gauff 3.0, focused on fixing the serve and forehand. She and her team figured it would be a three- or four-month project.

His most effective tool is his serve, plus-one forehand. Next time you’re watching a Khachanov match, pay attention to how many forehands he hits right after his serve compared to backhands.

Yes, she has — on her serving and her forehand — and the strides made in both of those areas are among the reasons Gauff is considered one of the few women ready to challenge two-time ...

AP photo by Mark Baker / Coco Gauff plays a forehand return during a practice session Thursday in Melbourne as she prepares for the start of the Australian Open this weekend.