UPDATED: Australian Open: Injured Nadal loses out to Mcdonald in second round

Defending Australian Open champion Rafael Nadal has been dumped out by World No.63 Mackenzie Mcdonald.

The 27-year-old American beat Nadal in three straight sets of 6-4 6-4 7-5 in two hours and 32 minutes early Wednesday.

Natal, ranked No.1 at Melbourne, made 31 unforced errors in the second-round exit.