Nadal said it was a "privilege" to face Federer in their ninth final, and first since the 2011 French Open. Photograph: (AFP)
Nadal pulled off one of his greatest victories in denying Dimitrov, 6-3, 5-7, 7-6 (7/5), 6-7 (4/7), 6-4 in four hours and 56 minutes
Rafael Nadal set up an Australian Open final against his great rival Roger Federer after edging Grigor Dimitrov in a classic five-set semi-final which stretched for nearly five hours on Friday.
Nadal pulled off one of his greatest victories in denying Bulgaria's Dimitrov, 6-3, 5-7, 7-6 (7/5), 6-7 (4/7), 6-4 in four hours and 56 minutes in front of a rocking Rod Laver Arena crowd.
Nadal showed his incredible fighting qualities to claw back from 0-30 down in the ninth game of the final set to break Dimitrov's serve with two tremendous chases to put away the winning volley to lead 5-4.
Dimitrov bravely saved two match points as Nadal served out for the match before the Spaniard clinched the victory, sinking to his knees in relief and jubilation.
Nadal said it was a "privilege" to face Federer in their ninth final, and first since the 2011 French Open.
"It's a very special thing, I think for both of us to be in the final of a major again and have another chance to compete with each other again after a couple of years having some problems," he said.
"I think both of us never thought we were going to be here again in the final of the Australian Open."
Nadal, who downed Federer in 2009 final, won through to his fourth Australian Open final and his 21st Grand Slam final. He leads Federer leads 6-2 in their major finals.
The 30-year-old Spaniard has been out of the Grand Slam limelight since his last title success at Roland Garros in 2014, as injuries sidetracked his glorious career.
Nadal is bidding to win his second Australian Open title and become the first man in the Open Era –- and only the third man in history –i to win each of the four Grand Slam titles twice.
Nadal and Dimitrov played each other to a standstill in Friday's epic, with two tiebreakers going either way in a semi-final that ran well past midnight.
Federer, who beat fellow Swiss Stan Wawrinka in Thursday's first semi-final, was watching on with relish as his rival in Sunday's final was taken the distance in a draining physical battle.
The last time both men's semi-finals went to five sets at any Slam was at 2009 Roland Garros when Federer beat Juan Martin del Potro and Robin Soderling defeated Fernando Gonzalez.