But more recently the 17-time grand slam winner has been the one suffering heartache in Melbourne. Rafael Nadal (left) consoles Roger Federer after beating him in the 2009 Australian Open final. Sharapova uncertain tooNadal isn't the lone grand slam champion whose fitness is uncertain returning from injury. In Melbourne this year, she might be asked: 'What does it feel like to defend a grand slam?' A former men's pro, Witt began as a hitting partner with the seven-time grand slam winner in 2007 prior to becoming her traveling coach.

Source: CNN January 13, 2019 00:22 UTC