World number two Roger Federer takes on third seed Novak Djokovic in the first of the men's Australian Open semi-finals on the Rod Laver Arena.

What an extraordinary result, and it's a quite incredible win for Djokovic, who downs Federer and ensures that neither of the top two seeds will be present in the final of a Grand Slam for the first time since the Serb won the Australian Open, beating Jo-Wilfried Tsonga in the final! Djokovic will now face the winner of the second semi-final between Britain's Andy Murray and David Ferrer of Spain which will take place tomorrow from 08:30 UK time!

FEDERER 6-7 5-7 4-6 - GAME, SET AND MATCH - Djokovic hammers two forehands cross court for 30-15, and a humongous serve outwide gives him two match points! The crowd are going crazy, and twice the Serb has to stop to catch his breath... the atmosphere is incredible in the Rod Laver. Djokovic plants a tame forehand into the net to squander the first, and he goes long to waste the second. The Serb grabs another with an ace outwide, and finally he does it - Djokovic is through, Federer is out!

Right, with new balls in his hand, Djokovic prepares for one of the biggest games of his career! This is it, can Federer find a last-gasp response to save himself from a semi-final exit in Melbourne?

FEDERER 6-7 5-7 4-5 - BREAK - Incredible stuff! Djokovic races to 0-40 with two belligerent forehands which throw Federer off guard, and a present from the Swiss who miscues a backhand. Federer retrieves the first two break points with well-worked rallies to outwit his opponent, but a tame backhand into the net hands Djokovic another break! All the Serb has to do now is hold serve for a place in the final... can he do it?

FEDERER 6-7 5-7 4-4 - BREAK - Another epic rally is won by Djokovic at 15-15 as Federer makes a real hash of a backhand which he slices long, and the Serb clenches his fist in delight. But the Swiss drills a forehand cross court which clips the line, and that was a scorcher! Djokovic is utterly unerring as he mullers two forehands down the line from in court to follow up big first serves, only to head back to deuce with a scuffed forehand, and two sublime rallies give Federer the break back!

FEDERER 6-7 5-7 3-4 - Federer storms into a 40-0 lead on serve with three crisp first serves to pin Djokovic firmly back behind the baseline and, despite the Serb clattering a forehand winner cross court, that is the only point he can muster as the Swiss holds. The pressure remains firmly on Djokovic to hold his composure on serve now, and he is going to have to work very hard indeed.

FEDERER 6-7 5-7 2-4 - Djokovic is forced to work tirelessly as he battles his way to 40-15, but goes wide with a forehand down the line as Federer gets his reward for some dogged defensive play at the back of the court. The number three seed still manages to hold, however, as he lashes a forehand cross court to beat Federer's despairing lunge and he restores his two-game cushion!

FEDERER 6-7 5-7 2-3 - Federer has a steely look of determination as he senses that he must lift his level once more to challenge Djokovic, who is playing some inspired tennis on Laver right now! The Swiss finds his groove with his forehand and belts two cross court for winners to thwart his opponent, and he holds to narrow the deficit once more. Can he challenge the Serb's serve now?

FEDERER 6-7 5-7 1-3 - Djokovic consolidates his break of serve with a determined service hold to 30, and Federer is looking despondent as he goes over to his chair to use the towel. The Swiss has to hold his serve now and try to break Djokovic, but time is fast running out for the world number two!

FEDERER 6-7 5-7 1-2 - BREAK - Another enthralling game goes to deuce as Federer pounds two sparkling forehand winners, and Djokovic wins improbable points with his harrying around the court. Federer miscues a backhand once more as it balloons wide and he gifts the Serb a break point, and he ruthlessly capitalises to seal what could prove to be the crucial break of serve! Federer is in big, big trouble now!

FEDERER 6-7 5-7 1-1 - It's another truly epic game as Djokovic is forced to battle extremely hard for every single point in an extended deuce, and Federer saves three game points as he refuses to let his opponent off the hook. Djokovic is handed another as Federer goes wide with a sliced backhand, but the Swiss makes amends with a majestic backhand cross-court pass! A near-replica gives him a break point, and he finally takes it to clinch an incredible game!

FEDERER 6-7 5-7 1-0 - Again it is Federer who serves first as he establishes himself in the third set with a service hold to 15, and the Swiss looks incredibly focused as he throws away the balls and immediately walks over to his position ready to return. This really is last-chance saloon for the world number two - what can he do on Djokovic's serve now?

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Novak Djokovic is enjoying playing his 'best tennis' at the 2011 Australian Open, and claims he has 'nothing to lose' in this match with defending champion Roger Federer

FEDERER 6-7 5-7 - SET - Djokovic is unwavering as he slams a forehand down the line for 30-0, then Federer helps him on his way with a miscued backhand pass which drifts wide - the Serb has three set points! Djokovic forces Federer out of court with a powerful forehand, before drilling a crisp backhand into the open court to clinch the second set - he's two up and looking set to down the world number two and reach the Australian Open final at this juncture!

FEDERER 6-7 5-6 - BREAK - What has happened to Federer? His first serve percentage drops to 46 for the set as he slumps to 0-40, and Djokovic is playing absolutely inspired tennis as he capitalises on his opponent's apprehension. Federer saves the first break point, clobbering a forehand down the line, and the Serb slips to lose the next point too. But Federer plants a tame backhand into the net, and all of a sudden Djokovic can serve out for the second set - what drama!

FEDERER 6-7 5-5 - Djokovic levels at 5-5 with a blistering backhand to close out the game, and Federer is thwarted despite challenging all the way and ensuring that the Serb is given a torrid time in holding serve. This second set is now finely poised at 5-5, and Federer has to hold!

FEDERER 6-7 5-4 - BREAK - The drama never ceases to abate as Djokovic fires a stunning forehand cross court to move to 30-40 and grab a break point, and he clinches the game with a whipped pass down the line as Federer is ruthlessly punished for a bemusing and very surprising drop shot which does not come off at all! We're back on terms in this second set, with the Serb to serve...

FEDERER 6-7 5-3 - Djokovic holds to 30 as he shows impressive composure to close out a game which Federer was determined to win to alleviate the subsequent pressure on his serve. The Serb clinches it with a forehand winner, and now Federer must serve out for the second set!

FEDERER 6-7 5-2 - Djokovic forces a break back point as he unleashes a sublime backhand cross-court pass which finally beats the world number two's defences, but Federer fires a resounding forehand down the line to take the game into deuce. The Swiss wins a breathtaking point with an exquisite lob which drifts agonisingly over the reach of Djokovic, and he holds to his opponent's immense frustration - what a game!