MELBOURNE - Reigning champion Novak Djokovic swept into the third round on Thursday and warned he felt more comfortable at the Australian Open than anywhere else - although he insisted he was not "invincible".

The world No 1 was in imperious form in handing out a straight-sets demolition of Colombia's Santiago Giraldo to move into the last 32 at the year's opening major tournament.

The Serbian top seed cruised to a 6-3, 6-2, 6-1 win in 1 hr, 42 min over the 56th-ranked Giraldo, and will next face Frenchman Nicolas Mahut.