Hello and welcome to our live coverage of the first of today's women's semi-finals between Caroline Wozniacki and Li Na.

WOZNIACKI 6-3 5-7 3-6 - GAME, SET AND MATCH - What a victory for Li, who holds her nerve impressively to clinch a quite stunning win and to seal her place in the Australian Open final! The Chinese player makes history as she seals her progression to the final for the first time, and she is utterly jubilant as she closes out the match with staggering composure! Wozniacki, the world number one, is out. Li will face either Kim Clijsters or Vera Zvonareva in the women's showpiece.

WOZNIACKI 6-3 5-7 3-5 - BREAK - Li will not be denied as she bludgeons two fierce forehands cross court to breach Wozniacki's defences, and she breaks the world number one from deuce, roaring back from 40-30 to seize the advantage once more - can she now serve out for this match?

WOZNIACKI 6-3 5-7 3-4 - BREAK - This match just refuses to settle down as it sways drastically one way, then the other with the momentum swinging quite incredibly! Wozniacki unleashes a barrage of fierce groundstrokes to stun her opponent, and the Dane breaks from 30-40 with a crisp backhand - we're back on terms yet again!

WOZNIACKI 6-3 5-7 2-4 - BREAK - Wozniacki hammers two crisp forehands down the line to assume a 30-0 lead, but the Dane capitulates under immense pressure from Li, who roars back to break serve after an extended deuce, and the Chinese player is showing incredible spirit and guile as she now holds the firm ascendancy in this final set.

WOZNIACKI 6-3 5-7 2-3 - Li storms to 40-0 with a great deal of conviction and determination, finding three first serves, and Wozniacki can only muster a solitary game in response as the ninth seed assumes the lead in this final set. Can she break the Dane's serve once more?

WOZNIACKI 6-3 5-7 2-2 - BREAK - What an extraordinary match this is! Li breaks her opponent's serve to love, and the Chinese player is suddenly right back in the contest once more - the world number one is utterly stunned as she commits two unforced errors and squanders her advantage.

WOZNIACKI 6-3 5-7 2-1 - BREAK - Li assumes a 40-15 lead on serve, but Wozniacki refuses to give up and powers a forehand down the line, before hammering a backhand cross court to take the game to deuce. The Dane is utterly relentless, and she clinches what could prove to be a crucial break with a stunning backhand to force the error from Li, and she takes control of this final set!

WOZNIACKI 6-3 5-7 1-1 - Wozniacki holds with a flurry of belligerent groundstrokes, and the Dane holds her composure impressively to establish herself at the start of this third set - both players look assured on serve all of a sudden, but who is going to find the first break?

WOZNIACKI 6-3 5-7 0-1 - What a game, and what spirit from Li, who comes through an epic extended deuce to fend off Wozniacki with an incredibly gutsy hold, and the Chinese player looks to be requesting the trainer as the players change ends. Now, how will Wozniacki respond?

Surely this huge news in women's tennis has not escaped you? Former world number one Justine Henin has quit tennis, for a second time, after doctors advised her to end her career due to an injured elbow.

WOZNIACKI 6-3 5-7 - Li levels at one set all! She takes it at the second time of asking, having wasted the first opportunity with an unforced error, as Wozniacki serves up her second double fault of the match! This one's going all the way!

WOZNIACKI 6-3 5-6 - Look at this! Li confirms her break and completes the turnaround with a love service game! And now the pressure is firmly on Wozniacki. How the pendulum swings out there on a tennis court!

WOZNIACKI 6-3 5-5 - Li saves match point with a wonderful forehand before she goes on to break back and stay in the match! That off the back of two fantastic returns of serve! Great stuff to watch!

WOZNIACKI 6-3 5-4 - Some loose play from Li gifts Wozniacki two break points and another one - a forehand that lands well out - gives the world number one the break - at the most crucial of times! She's now one service game away from the match - and a place in the final!

WOZNIACKI 6-3 4-4 - Li is back in it! Wozniacki seems to be cruising to another game, but Li fights back to force deuce before going on to break! And we're back on serve in the second set!

WOZNIACKI - 6-3 4-3 - Li hits one long at the baseline and Wozniacki has a 30-0 advantage. But the Chinese roars back to hold serve and hang in there! Still, she needs a break of serve - and fast.

WOZNIACKI 6-3 4-2 - Absolutely no problems for Wozniacki on her next service game. The Dane is edging closer to a place in the final, against the winner of today's later women's semi between Kim Clijsters and Vera Zvonareva.

WOZNIACKI 6-3 3-2 - Another great response from Li as she races to a 40-0 lead. She drops the next point but a clean ace hands her the game! The Chinese player's winning run heading into this match stands at 10, having triumphed in Sydney prior to heading down to Melbourne.

WOZNIACKI 6-3 3-1 - Number one seed Wozniacki confirms her break without too much ado and this next game for Li is vitally important. The top seed has reached the final of the Aussie Open 31 times in the Open era (this is the 43rd Aussie Open).

WOZNIACKI 6-3 2-1 - Li saves some of her best tennis of the game for the first two break points she faces - on the first she aces and the second she wins with Wozniacki failing to get to her dink over the net. But Wozniacki is tenacious and when she brings up a third, Li hands her the game on a plate!