Belarussian Victoria Azarenka needs to win tonight's Australian Open final to hold onto the world number one ranking.
Azarenka is into her third Grand Slam final, having won in Melbourne last year.
The defending champion says China's Li Na has shown how dangerous she is in knocking out Maria Sharapova.
"She's in incredible form right now and in the finals anything can happen and it looks like she improved a lot. It'll be a tough match so I'm really looking forward to it."
The final gets underway around 9:30pm.
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