Melbourne  - Dinara Safina is prepared to celebrate with a chocolate cake should she deny Serena Williams a fourth title at the Australian Open when the pair meet in Saturday's women's final.

Safina, younger sister of 2005 men's champion Marat Safin, is also playing for history with the match-winner taking over the number one WTA ranking from Jelena Jankovic.

In addition, a dream victory would bury the demon of Safin's Roland Garros finals loss to Ana Ivanovic on clay last spring in Paris.

"To win tomorrow and to be number one in the world, I don't know, I'll go and buy chocolate cake," said the unassuming 24-year-old .

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

The sweet delight would be just the ticket for Safina, who normally is denied the luxury under the strict nutrition plan which has lifted her game over the past year.

Should she keep second seed Williams from a tenth career Grand Slam singles honour, Safina and elder sibling Marat would become the first brother-sister pair to ever hold top rankings.

Williams goes in with an edge, having won five of six encounters including two in 2008 against Safina. The 27-year-old American is on an odd-year streak at Melbourne Park with 2003, 2005 and 2007 titles.

"I'm excited that I'm playing really consistently, at least making it to the finals of Grand Slams," she said.

"As for number one, it's definitely more important for me to stay there than just to get there. Right now that would be just a bonus.

"My goal isn't to be number one, my goal is to now win one more match here at the Australian Open."

Williams knows she is facing a more experienced contender in the maturing Safina, "She's playing well, doing a great job.

"She's going to be a tough opponent and is playing amazing."

Safina says she got a quick text of support from her big brother. And she is hoping to duplicate his title feat over Lleyton Hewitt and take inspiration from the player she calls, "my idol."

"It's just amazing feeling when you know, because he won it (Melbourne). For us tennis players, a Grand Slam, it's something very big.

"To know that he won it, it's just unbelievable feeling. It just made me, want to have it one day." (dpa)