But the 22-year-old's burning desire for a Grand Slam breakthrough which would make her No 1 in the world sits alongside her hunger for a simple slice of chocolate cake.

Safina said she normally never touched chocolate but would make an exception if she beat Williams because she would deserve a treat.

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"To win on Saturday and to be No 1 in the world, then I'll go and buy chocolate cake," she said.

"This would be my present for myself, that, yes, I can eat that chocolate cake."

Food has also played a part in Williams' campaign at Melbourne Park, with the American posting footage of herself eating a hotdog on her website before the tournament began under the title "Preparing for the Australian Open.

"I'm eating a hot dog. How pretty is it? I almost don't want to eat it - it's picture perfect," she says before chewing down on the mustard-smeared snack.