Hello and welcome to live coverage of the women's semi-final of the WTA year-ending WTA championships in Istanbul. Petra Kvitova and Sam Stosur will fight it out for a place in the final.

So Kvitova will meet either Victoria Azarenka or Vera Zvonareva in tomorrow's final.

STOSUR 7-5 3-6 3-6 - GAME, SET AND MATCH! Brilliant play from Kvitova as she scoops up a low ball and sends a winner flying past Stosur. She's not giving up this set and goes 40-0 up. Three match points for Kvitova and she's through to the final. Stosur is still to record a win against the Wimbledon champion.

STOSUR 7-5 3-6 3-5 - Stosur's comeback contines as she picks up another point. Kvitova's unforced arrors are making this a lot easier for Stosur as she takes a 40-15 lead. Three games in a row for Stosur as Kvitova's shot is out.

STOSUR 7-5 3-6 2-5 - Impressive play from Stosur with a succession of forehand return winners that Kvitova has no chance of stopping. Stosur breaks to love as Kvitova's return shot is out. Game Stosur.

STOSUR 7-5 3-6 1-5 - Kvitova comes skipping back onto the court, but it's first blood to Stosur. It looks like Stosur might get some points on the board as she takes a 40-15 lead in this set. And she's on the scoreboard! Stosur's won that game.

STOSUR 7-5 3-6 0-5 Great play from Kvitova leaves Stosur staring after the ball. Kvitova is in cruise control now and wins her seventh consecutive game.

STOSUR 7-5 3-6 0-4 - Stosur serves and hits the ball long. Kvitova quickly finds herself 40 love up and the match is hers for the taking. She's got a foot in the final as she takes the game.

STOSUR 7-5 3-6 0-3 - Kvitova A great rally that has Stosur running back and forth eventually sees Kvitova botch her shot and hit it short into the net. Scores are level at 30 all. Stosur's unforced errors mean Kvitova wins her fifth game in a row and leads 3 love in the final set.

STOSUR 7-5 3-6 0-2 - Unforced errors form Kvitova gifts Stosur a 30-15 lead, but erratic returns from the Australian are proving costly as she reliquishes her lead. Kvitova is now two love up in the final set.

STOSUR 7-5 3-6 0-1 - It's the third set and Kvitova serves. She double faults before serving her sixth ace and takes a 40-15 lead. Another scream from Kvitova signals a win in this game as Stosur's shot hits the net.

STOSUR 7-5 3-6 - Stosur fires a brilliant backhand volley past Kvitova and it's 15-15, before she hits another winner for 30-15. Brilliant from Kvitova, though as she takes the lead for set point. Stosur's return into the net means Kvitova breaks again and it's a set apiece.

STOSUR 7-5 3 -5 - Kvitova's fifth ace puts her 30 love up and leaves Stosur flat-footed. But two winners from Stosur sees the scores level at 30 all. Kvitova's class shows through as she plays a really difficult volley to take the fifth game.

STOSUR 7-5 3-4 - But Stosur is back in charge in the fifth, quickly taking a 30 love lead. It's short-lived though, as she sends a backhand into the net. Kvitova needs to control her return shots better, as another one goes wide and Stosur is 40-15 up. Stosur is still very much in this match as she hangs on to take the game.

STOSUR 7-5 2-4 - Kvitova takes a closely-contested fourth game as she rushes towards the net and smashes the winner onto Stosur's return.

STOSUR 7-5 2-3 - Kvitova is flying now and storms to a 40 - 0 lead in the fourth game. But Stosur's serving well and she wins two points to bring the scores from love 40 to deuce. An unforced error and a long return mean that it's game Stosur.

STOSUR 7-5 1-3 - Impressive play by Kvitova as she comes forward to pick up Stosur's drop shot and get the winner. Kvitova wins her third game in a row with ease.

STOSUR 7-5 1-2 - Kvitova has overcome the slump she had in the first game of the second, as she takes another game here.

STOSUR 7-5 1-1 It's 30-15 to Kvitova and she needs to close this game out. Stosur is brimming with confidence after taking the first set and brings herself back into the game. Break point now for Stosur but Kvitova fights back. It's deuce. Kvitova makes hard work of it but she eventually takes the game.

STOSUR 7-5 1-0 Kvitova looks disappointed and flat all of a sudden, and it's showing in the second set as she quickly goes 40 - 0 down to lose the first game.

STOSUR 7 - 5 - SET! A winner for Stosur as she slices a backhand, rushes to net and forces a error on Kvitova. Two set points for Stosur as hawkeye rules in her favour, showing Kvitova's shot to be out by the narrowest of margins. And Stosur is now in control. She takes the first set 7 - 5 from a break behind.