Federer marches into last four

Defending champion Roger Federer completed yet another straight-sets victory at the Australian Open to set up a semi-final with sixth seed Andy Roddick.

The Wimbledon champion is yet to drop a set in Melbourne in his pursuit of a 10th career grand slam title, and had little trouble in seeing off seventh seed Tommy Robredo 6-3 7-6 (7/2) 7-5.