MELBOURNE (AFP) - China's Li Na was left cursing her luck after she twice took a tumble and briefly knocked herself unconscious in a disastrous Australian Open final on Saturday.

Li was a set up against Victoria Azarenka when she first went over on her left ankle, and she fell again in the third set, immediately after a break for Australia Day fireworks, smashing the back of her head on the court.

The world No. 6 did not blame her misfortune for the 6-4, 4-6, 3-6 defeat, but she admitted she was a "little bit worried" when she blacked out after banging her head.

"I think I was a little bit worried when I fell down and my head hit the floor, because for two seconds I couldn't really see anything. It was totally black," she said.

"So when the physio come, she was like, 'focus on my finger'. I started laughing. I was thinking 'this is a tennis court, not a hospital'."

Li, 30, was seeking her second Grand Slam title and was in the Australian final for the second time, after her 2011 loss to Kim Clijsters.

Although she teared up immediately after the defeat, Li put on a brave face and joked when she met reporters later.

"After the match, I was feeling like, 'how many years since I fell down on the court?' I mean, it was amazing today. It was twice on the court," she said, calling herself "stupid" for the accidents.