World no.2 Rafael Nadal on Thursday announced that he will be out of action for six to eight weeks, after picking up an injury during his Australian Open second round game on Wednesday. Defending champion Rafael Nadal crashed out of Australian Open on Wednesday, losing in straight sets in the second round to USA's Mackenzie McDonald 6-4, 6-4, 7-5. Nadal, the No. 1 seed in this year's first Grand Slam, was affected by injury and it changed the tone with which he was playing. Facing the 65th-ranked American Nadal produced his 'worst Grand Slam result' in seven years.