Hello and welcome to LIVE coverage from the final match of today at the WTA Championships in Istanbul. It's Maria Sharapova against Agnieszka Radwanska and it will be getting underway very shortly

SHARAPOVA 5-7 7-5 7-5 - GAME, SET & MATCH! Sharapova ends the match with an ace! What were the chances?? She has struggled on serve all day but to end on an ace should help her confidence heading into her final match against alternate Sam Stosur on Friday.

SHARAPOVA 5-7 7-5 6-5 - BREAK! Sharapova is not giving up on this, as usual, as she breaks to finally leave herself with an opportunity to seal this match. Radwanska just faltering at the last, as she looks tired and even her normally indefatigable defence begins to break down

SHARAPOVA 5-7 7-5 5-5 - Sharapova holds firm and this is when she is at her best - with her back against the wall and with no other choice but to hold to keep the match alive. Just FYI, it is now gone 2am in Turkey!

SHARAPOVA 5-7 7-5 4-5 - Radwanska now potentially just one game away as she holds to force Sharapova (and her often dodgy serve) to stay in it. Can she hold firm this time?

SHARAPOVA 5-7 7-5 4-4 - Sharapova battles through another service hold that sees her level up once again. Incredible defence from Radwanska once again though to get everything back time and again to frustrate the Russian

SHARAPOVA 5-7 7-5 3-4 - Finally! A hold of serve! And it goes to Radwanska as Sharapova misses a couple of forehands and the Pole does what she does best of getting everything and anything back in play until the opponent goes for too much or simply cannot get to the ball. Radwanska potentially just two games away from the win now, although the way this match has been going, there is still plenty of time for some more twists and turns!

SHARAPOVA 5-7 7-5 3-3 - BREAK! Running out of words to express my constant surprise at the topsy-turvy nature of this match as Sharapova once again hands momentum back to Radwanska with a poor service game that hands teh Pole the immediate break back. We are back on serve yet again in this final set

SHARAPOVA 5-7 7-5 3-2 - BREAK! Radwanska is starting to flex her heavily strapped right shoulder more and more frequently now. It's been a problem all year for her that right shoulder despite the fact that she eases out to a 40-15 lead in this game. But Sharapova fights back with a couple of forehand winners and an error from Radwanska and the Russian goes on to break with a forehand winner and a ferocious yell of "come ooooonnnnnn"

SHARAPOVA 5-7 7-5 2-2 - Sharapova challenges a call on the baseline but Radwanska is standing right over it and it was clearly out. The Russian still goes on to hold though and level up once again as this match trickles towards it's conclusion. Super slow play from both players now

SHARAPOVA 5-7 7-5 1-2 - Still on serve in this final set although it is proving to be a real struggle for both women now to get any kind of momentum. Which is kind of fair enough when you consider it is nearly 1.30am in Istanbul. Pretty late to be playing tennis, especially when you consider that they reasonably expected to be on court as early as 9pm (Turkish time)

SHARAPOVA 5-7 7-5 1-1 - A lot more positive now from Sharapova as she eases, comparatively, through a service hold without any real drama, finding a first serve (that Radwanska cannot return in court) to seal the game

SHARAPOVA 5-7 7-5 0-1 - A very important hold for Radwanska to begin the third set after what was a frustrating end to the second set for her. She bounces back with a hold but you still get the feeling that this set will be all about Sharapova; if she can harness her shots then she should win it, if not solid, dependable, impressive Radwanska should win

SHARAPOVA 5-7 7-5 - SET! A brave or foolhardy, depending on which way you look at it, second serve ace from Sharapova helps her on her way to finally serving out the set and enjoying some success in this match. Can she keep it going though?

SHARAPOVA 5-7 6-5 - BREAK! Much better again from Sharapova, albeit not until late in the game, when she finally comes up with a winner to break yet again. She will have a second chance to serve out this second set and force the third. That's five out of the last six games which have been a break in serve. All being led by Sharapova; she's on top when she can control it, Radwanska is on top when she can't

SHARAPOVA 5-7 5-5 - BREAK! A seventh double followed by a shocking error is not a great start to the game from Sharapova before another unforced error, a forehand this time, hand Radwanska three break back points ... but only one is needed as a forehand about a foot long leaves the Russian looking close to tears. She seems totally perplexed by her game tonight. We're back on serve again

SHARAPOVA 5-7 5-4 - BREAK! Radwanska appears to be cruising towards a love service hold that would leave Sharapova serving to stay in the match but the Russian unleashes a fearsome series of points to level at deuce with consecutive winners. A couple of errors allow Radwanska the chance at a game point but one step into the court and a forehand winner from Maria denies Aga. And Sharapova breaks pushed Radwanska around the court and drawing the cross court error. Sharapova will serve for the set

SHARAPOVA 5-7 4-4 - Wow! After all that hard work to get back on track in this second set, Sharapova nearly undoes it all with another couple of double faults. A drive volley winner earns her a game point from 30-30 but she slaps a retreating forehand into the net to see Radwanska level at deuce. But the Russian does hold on and keep the match alive for at least a few more games

SHARAPOVA 5-7 3-4 - BREAK! That's more like the Sharapova we know as she quickly earns herself three break back points with a booming forehand return of serve winner down the line. It helped that Radwanska missed a couple of first serves but that was much much better from Sharapova who had no choice but to just attack the ball

SHARAPOVA 5-7 2-4 - BREAK! The Russian's first double fault for a while could hardly have come at a worse time as it allows Radwanska to level at deuce. She recovers in time to get her first serve in on the next point only to send a cross court backhand wide with her second shot. Sharapova recovers again with a great touch volley only to hand Radwanska a break point with another error before also missing a forehand to hand her opponent the break

SHARAPOVA 5-7 2-3 - Radwanska posts another straight forward service hold in this comparatively underwhelming match. Radwanska is her typical business-like self, Sharapova is frustrated and the crowd seem subdued after the drama of the Azarenka-Kerber match earlier this evening