Melbourne: Novak Djokovic and Roger Federer begin their quest for five Australian Open titles while Serena Williams is chasing her 19th Grand Slam crown in the year's first major starting today.


Roger Federer and Novak Djokovic 

Federer (33) will be again be the sentimental favourite, pursuing his 18th major title having not won one since Wimbledon 2012. There are question marks over Rafael Nadal's match fitness following a wrist injury and later an appendectomy.