Novak Djokovic could beat Andy Murray in the semifinals at the Australian Open . At No . 7 , Federer is at his lowest ranking in 11 years . Roger Federer and Rafael Nadal face a potential quarterfinal showdown in New York . Serena Williams begins against another grand slam winner , Venus Williams . Former winner Maria Sharapova pulled out of the tournament with a shoulder injury .
Novak Djokovic could beat Andy Murray in the semifinals at the Australian Open . Roger Federer and Rafael Nadal face a potential quarterfinal showdown in New York . Serena Williams begins against another grand slam winner , Venus Williams . Former winner Maria Sharapova pulled out of the tournament with a shoulder injury .