The two men had another epic five set final, which ended after midnight and took the 2009 Australian Open into a third week.
The 7-5, 3-6, 7-6, 3-6, 6-2 result was Nadal's third victory over Federer in their last three meetings at Grand Slams, and it left the Swiss one win short of Pete Sampras' record of 14 majors.
At the prize giving ceremony Federer tried to address the crowd, but all he could say was "God, it's killing me." Federer then stepped away from the microphone to compose himself. Nadal went over to him to put an arm around his rival.
In his victory speech, the first thing the Spaniard said was: "Sorry for today, Roger."
The moment summed up what made the rivalry between the two at their peak such a wonder to fans of the sport.
Watch the moment below: