2.14pmNovak has been imperious this week, topping his group to stay on course for a £1.7m jackpot for staying unbeaten.
2.15pmDel Potro beat Djokovic earlier this year in London, winning at Wimbledon to secure an Olympic bronze medal.
2.16pmDjokovic has won their last two meetings but Del Potro is right back on form after beating Roger Federer in convincing fashion last night.
2.17pmThe world number one has benefited from an extra day's rest and is the clear favourite as the player's make their way to the court.
2.18pmThe 02 Arena creates an impressive atmosphere for this event, building the tournament into the showpiece occasion the standard of play deserves.
2.21pmCoin toss completed, the formalities are out of the way. Djokovic has chosen to serve first, game on!
2.23pmNovak will get us underway shortly, really interesting battle of Del Potro's raw power and the Serb's relentless style.
2.25pmDel Potro is limbering up with that ferocious serve which will be undoubtedly be a weapon during the course of this match.
2.27pmWe're about to get underway, Djokovic to serve first.
2.30pmNovak looks ready for a comfortable hold before making a pair of unforced errors. 40-30
2.31pmMake that three errors for Djokovic, very strange to see mistakes like that from the world number one. Deuce.
Djokovic 1-0 Del PotroDel Potro tries to apply pressure at deuce but hits a heavy forehand long to hand Djokovic the opening game.
2.34pmAn awesome point on Del Potro's serve. Djokovic performs minor miracles at the baseline to keep the rally alive before the Argentine swats aside a volley at the net to claim the point.
Break PointDjokovic steps up the intensity to earn two break points. Del Potro saves the first with a trademark serve then cracks a massive forehand down the line. Deuce.
DeuceThat huge forehand was clocked at 94mph, a huge shot that has the crowd purring. Del Porto follows that up with a big serve but Novak hits back instantly for Deuce 2. High class stuff already from the in-form pair.
Game Del PotroThe big man responds well and uses his serve to close out his opening service game. Important early hold there for Del Porto.
Djokovic 1-1 Del PotroNovak races to a 40-0 lead with a series of quality shots including a wonderful forehand winner.
Djokovic 2-1 Del PotroDjokovic gets his first ace to bring up a comfortable hold. All to easy on serve for the world number one.
SmashDjokovic has Del Potro moving all over the court, toying with the Argentine before wrapping up the point with a huge overhand smash. Del Potro responds with a 126mph serve to go 30-15 ahead.
Game Del PotroBig hold for Del Potro as he matches a big serve to a strong forehand to tie the scores at 2-2.
2.47pmSuperb exchange at the net after a short lob from Djokovic. Del Potro responds with a brilliant backhand smash to make the score 30-15.
Djokovic 3-2 Del PotroDel Potro fails to build momentum and launches a forehand into the net to keep the match on serve in the first set.
2.51pmA succession of forehand missiles win Del Potro the opening point of his next service game. His raw power is frightening at times.
2.53pmDel Potro mixes his game up to great effect, using a lovely drop shot to find Djokovic napping.
3.29pmSpoke too soon there as Del Potro serves his first double fault of the match. He recovers to build a 40-30 lead.
Del Potro holdsNice recovery from Del Potro as he continues to build momentum. We're all square and on serve early in the second set.
3.33pmShocking start in the next service game for Djokovic who continues to struggle on his forehand. A pair of errors quickly find the Serb 0-30 down.
Three Break PointsHuge chance for Del Potro as he takes a 40-0 lead on Novak's serve. The first break point goes begging with a long forehand.
Game Del PotroAn unbelievable rally sees Del Potro earn the crucial break. He stays strong at the baseline and unleashes a corker of a forehand to leave Djokovic with no chance. That puts the Argentine a set and a break ahead.
Djokovic 4-6 1-2 Del PotroThat last rally was a 33-shot marathon but it was Djokovic who seemed to visibly tire which is surprising given all the talk about him having an extra day's rest.
3.38pmNovak needs to find a response quickly or his season will be over. Del Potro has upped the intensity and must now be considered the favourite to progress.
Two Break PointsDjokovic recovers to earn two break points of his own. Del Potro swats aside the first with a forehand winner and sends it to deuce with a monstrous 129mph serve.
DeuceTop-class tennis from Djokovic to earn a third break-point chance of the game.
Break PointA forehand goes long but Djokovic is unhappy with the call and uses a challenge to no avail. The ball is just out and we go back to deuce.
3.45pmAnother advantage for Djokovic after some sloppy play from Del Potro.
Break DjokovicThis time the Serb makes no mistake with his first break of the match. Back to 2-2 in the second set and could that be the catalyst for a Serbian revival?
3.47pmDjokovic looks revitalised and races to a 30-0 lead back on serve.
3.48pmA backhand up the line followed by a well-placed serve puts the Serb 3-2 ahead in the second set.
3.52pmDel Potro responds on serve with a forehand winner clocked at 102mph, awesome stuff. That's followed up by a volley at the net to go 30-0 up.
3.54pmDel Potro holds to level things up in the third set. He leads 6-4 3-3.
3.56pmDjokovic smashes home a pair of winners to go 40-15 ahead on serve. He follows that up with a timely ace to re-take the lead in the second set.
Two Break PointsDjokovic keeps the ball in play consistently and forces a string of errors from the Argentine to earn two break-point chances.
4.02pmDel Potro hangs on to take the game to 30-40 after a forehand winner hits the net for Novak.
Break DjokovicAnother big service return from Djokovic forces the mistake and puts the Serb firmly in control in this second set. Djokovic 4-6 5-3 Del Potro
4.04pmDjokovic is now serving to win this second set and level the match.
4.06pmDel Potro is fighting to respond and brings the game to 30-30. Pressure on!
4.07pmSet Point to Djokovic after a poor return from Del Potro. The world number one makes no mistake and we are level at a set apiece.
One Set All!A short break now before the deciding set begins. Del Potro had a chance to put this match away early in the second set but the relentless Djokovic responded brilliantly. All to play for now with the scores level.
4.10pmDel Potro gets things underway in the third set, winning the first two points thanks to unforced errors from Djokovic.
4.12pmDjokovic creates the chance to win a simple point but lashes a backhand into the net under no pressure. Very uncharacteristic from Novak and it costs him the opening game.
Djokovic 4-6 6-3 1-1Del Potro can't make an impact on the Djokovic serve and we're quickly at 1-1 in the third set.
4.17pmThe Argentine tries a cross-court forehand which goes agonisingly wide. He challenges the call to no avail.
4.18pmBig pressure for Del Potro on serve as another error puts him 0-40 down. Three break points for Djokovic.
Break DjokovicNovak puts some wonderful disguise on a curling forehand and breaks to love early in the deciding set. All the momentum is now with the world number one in an incredible turnaround.
4.20pmDel Potro has gone off the boil in the last 30 minutes after playing some superb tennis early on. He will have to find a break to stay alive in the tournament.
4.21pmDjokovic is full of confidence and has got the forehand working after some early struggles. He quickly holds to love and is in complete control at 3-1 in the third set.
4.23pmDel Porto gets back to basics on serve but can only produce a double fault to go 15-30 down.
4.25pmDjokovic has a small opening taken away as Del Potro recovers to earn an imperative hold. He now trails 2-3 in the third set.
4.27pmDjokovic continues to show his ruthless streak on serve. Keep this up and its hard to see a way back for Del Potro.
4.30pmDel Potro tries to apply pressure but Djokovic creates a superb angle on his forehand and makes no mistake to hold comfortably.
Djokovic 4-6 6-3 4-2The Argentine is back on serve and crunches the ball down the line for an easy ace. That serve is easily one of the most dangerous weapons in tennis today.
4.33pmDjokovic is moving the big man around to brilliant effect here. He glides a drop shot in play effortlessly for a highlight reel winner.
4.34pmDel Potro finds himself under pressure again but hangs on with a punishing serve at chest height to force deuce.
DeuceBreak point to Djokovic as Del Potro lets a forehand drift wide.
Break PointDjokovic makes no mistake with an awesome forehand winner to claim a double break in the third set. Del Potro has run out of steam at the business end of this match and it's a real shame.
4.37pmThe world number one has produced when it matters and will now serve for the match.
4.39pmDjokovic races into a 40-0 lead and its earns Three Match Points.
Game, set and matchDel Potro crashes a forehand into the net and Djokovic wins the matc.h from a set down 4-6 6-3 6-2.
Djokovic goes throughThe tournament favourite struggled at times in the opening set but recovered brilliantly to stun Del Potro with an increased tempo in the later stages. He now advances to face either Andy Murray or Roger Federer in tomorrow's final.
4.45pmDjokovic admits following a bruising encounter that securing a place in the final against Murray or Fed provided extra motivation. Tomorrow's final promises to be a classic.
4.48pmThanks for joining us at Sports Mole and be sure to check back in at 7.45pm tonight to see how Murray fares against Federer.