MELBOURNE (AFP) - Switzerland's Stanislas Wawrinka claimed his first Grand Slam tennis title in dramatic fashion on Sunday, when he upset injury-troubled world No.1 Rafael Nadal in the Australian Open final.
The eighth seed roared through the first two sets and overcame the distraction of a back injury to Nadal, and then the loss of the third set, to take it 6-3, 6-2, 3-6, 6-3 in two hours 21 minutes.
Nadal, who was chasing his 14th major title, looked as if might pull out with the back injury but he fought back to take the third set and force the match into a fourth set.
"For me it's the best Grand Slam ever. I'm enjoying very much to play here," Wawrinka said, who lost in five sets to Novak Djokovic in last year's fourth round.
"In one year a lot has happened. Right now I still don't know if I'm dreaming or not. We'll see tomorrow morning."
It was a stunning win for Wawrinka, who had not beaten Nadal in their previous 12 matches but rallied to win the fourth set and take the championship.
He took 36 Grand Slam appearances to win his first title, second only to Goran Ivanisevic who played 48 before he won Wimbledon in 2001.
Nadal was in tears as he said: "Many thanks Stan, you really deserved it, I'm very happy for you. I had bad luck against you today but you really deserve it.
"My team, I tried hard, thank you very much. Without them it would be impossible to be where I am today. Sorry to finish this way, I tried very, very hard.
"This year is one of the more emotional tournaments of my career."
Wawrinka began nervelessly and after holding his opening two service games for the loss of only two points he made the first move in the final, breaking Nadal in the fourth game. But he was three break points down serving out for his first-ever set against Nadal, only to win the next five points with some magnificent serves to go one set up in 37 minutes.
Fresh from his psychological breakthrough, Wawrinka broke Nadal to love in the opening game of the second with with a cracking backhand return winner.
The Swiss was in the zone, reeling off 12 consecutive points against the non-plussed Nadal, who received a time violation warning for slow play between points.
Nadal's problems mounted when he grabbed his back after playing a forehand.
He called for the trainer at the next changeover and went off the court for a medical time-out at 2-1 in the second set.
Wawrinka argued with the chair umpire about why he was not told what Nadal's injury was, as the crowd became restless with the Spaniard's seven-minute absence from the court. When Nadal re-emerged he looked distressed and lost his serve for a third time as Wawrinka charged to a 4-1 lead. The Spaniard sat with his head in hands at the changeover.
Wawrinka served out for the second set as Nadal disconsolately walked to his chair and received further courtside treatment on his back.
However, Nadal fought back and broke Wawrinka's serve for the first time in the final early in the third set.
The treatment or possible painkillers appeared to have some effect and Nadal began hitting the balls with more authority to lead 4-1 as mistakes began to creep into the unsettled Wawrinka's game.
Wawrinka had a couple of break points in the ninth game but Nadal served out for the third set to take the final into a fourth set.
Wawrinka's big forehand winner to the corner gave him a 4-2 lead and move within sight of the championship. But Nadal broke back after three break points in the next service game with a string of errors from the nervy Wawrinka.
However, Wawrinka broke Nadal again and he served it out authoritatively, winning the title with a forehand and raising his arms aloft in celebration.
Nadal has had injury problems in the past in Melbourne. He missed the 2006 and 2013 editions, had to retire injured in the 2010 quarter-finals, and was hit by a muscle strain during his 2011 last-four defeat to David Ferrer.