Women's number one tennis star chasing Steffi Graf's record

Serene Williams is already regarded as the greatest women's tennis player ever, but she's yet to do one thing another player has done.

Which is to win 22 Grand Slams.

Williams was on the verge of marching Steffi Graf's record of 22 Grand Slams before she was beaten by  Roberta Vinci in the .

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Another opportunity to march that record has come again as she out classed Agnieszka Radwanska to reach the final of the Australian Open.

Angelique Kerber is the only person that can stop Serena from marching Graf's record of 22 Grand Slams.

The 34-year-old however has said that she's not going to start thinking about breaking Graf's record.

"I definitely block it out,” she said.

"I was one off [from 22] last year, too. If I don't win on Saturday, I'll still be one off.”

Watch Serena Williams beat Angelique Kerber in the semi-final of the Australian Open, below: