Last Updated: 27/01/13 3:58pm
Bizarre end as the ball is rolled into the unguarded Spurs net past a balloon by Austin from the halfway line but the whistle goes somewhere on its journey and Leeds do go through 2-1 rather than 3-1.
Superb deep ball from Assou-Ekotto sets Obika free and he is clear on goal but he takes too long and fires over the top from close range under pressure.
More good work from Bale as Spurs seek the leveller but Dempsey's flick on the edge of the area can't find anyone bar Ashdown. Assou-Ekotto goes in the book.
Free-kick to Leeds near the right-hand corner flag of Tottenham. No ambition from the home side as they try and keep it in that area.
Free-kick for Leeds is chipped in to the Spurs box but just too strong for McCormack to bring under control.
Parker does well to keep on his feet under pressure but his shot from the edge of the Leeds area hits a defender.
Dembele gives the ball away casually and McCormack is away from halfway but Vertonghen stands in his way to give away the free-kick. And gets a yellow card.
Good play from Spurs again as Parker does well to almost find Obika but Byram is there to clear the ball off the Spurs player and it is behind for a goal-kick.
Dempsey shoots again and hits Byram but rather than chasing the ball, the American just wants to appeal for a handball.
Lees gets in the way of a close-range effort from Dempsey and the ball is behind with the slight suspsicion of a handball from the Leeds man.
More sublime skill on the left from Bale and the passgae of play leads to a Spurs corner on the left.
Paul Green tries to pounce on a woeful defensive headed clearance by Caulker but he can't find a white shirt in front of the Spurs goal.
Rory Christie says: "Hopefully Leeds can keep the lead and knock Spurs out of the cup. I'm an Arsenal fan but today I'm behind Leeds."
Good break by Leeds led by Austin but Varney can't maintain possession and the ball goes out. It comes after a big shout for a free-kick near the leeds area after Assou-Ekotto goes down following a hfty shoulder barge.
Tricky run by Lennon on the edge of the Leeds area but the ball gets rather stuck under his feet and his shot lacks any power.
Matt Bevens says: "Surely AVB realises now that we needed another striker in this window!!!!!!!! To play without one was foolish, we ain't Barcelona!!"
Comeback time for Tottenham? The Premier League side are now 11/4 to win and 15/8 to salvage a replay with Leeds 11/10 to progress.
Double switch for Spurs as Huddlestone and Sigurdsson are replaced by Mousa Dembele and Jonathan Obika.
GOAL TOTTENHAM: Bale digs out a great cross on the left depsite being surrounded by two Leeds defenders and Dempsey makes amends by glancing his header beyond Ashdown.
Parker makes a good run through the middle but Lennon overhits his pass and he has no chance to retrieve it as Ashdown collects.
Geat run and cross down the right from Lennon but his cross is fired horribly wide from six yards by Dempsey.
GOAL LEEDS: Superb second for the Championship side taken by McCormack. He latches onto a ball over the top from Hadji-Diouf, cuts back inside on to his left foot to outsmart Caulker and finds the far corner in majestic style beyond Friedel.
The lively Varney breaks into the Spurs box but Huddlestone gets back to make a a great tackle as the Leeds man is about to shoot.
Poor corner by Hadji-Diouf but it bobbles to McCormack on the edge of the area and he misses his kick.
Many thanks to Lee Corcoran, who says: "Good afternoon, big spurs fan and I'm enjoying the game so far. Leeds are having the better chances and a great goal. Spurs need to take control, we have an excellent squad out. Dempsey and Bale to score in the second half 1-2 spurs, coys."
Sky Bet say Tottenham are 7/4 to hit back after the break and win with Leeds now 6/4 favourites to progress and a replay 2/1. Bale and Dempsey are 4/1 joint-favourites to score next.
Late throw to Leeds on the left which is cleared and Bale breaks down the right. His cross is poor and easily cleared.
Friedel saves Spurs as a long ball forward from Ashdown is flicked on by Varney into the path of McCormack in the box but the American keeps the deficit at just one with his legs.
A lot of faffing aroundf to get the game restarted and the ball is punted back into the hands of Asdown.
The free-kick is taken and flicked on into the centre of the Spurs box where McCormack goes down under pressure. There is an appeal for a spot-kick but nothing doing.
Dempsey turns well 25 yards out and hits a swerving shot that Ashdown saves. Lees is there to help back to the keeper but there is a big suspicion of it being a backpass.
Superb ball forward from Michael Brown finds McCormack on the edge of the Spurs box. His first touch is excellent but the attempted shot under pressure less so.
Good battle between White and Bale going on down the right and Bale gives the defender a nudge to give away the free-kick.
Parker crosses from the right at full stretch and it is just a fraction in front of Dempsey as he tries to get an attempt on goal.
Bale and Aidan White tussle for the ball down the right. Both go to ground and Leeds get the free-kick.
Bit more pressure now from Spurs. Lennon found deep on the left and he cuts inside Byram but his shot is very tame and saved by Ashdown.
Free-kick on halfway to Spurs to be taken by Jan Vertonghen but he goes sideways rather than forward.
Fantastic run down the right by Bale as he beats two defenders. He closes in on goal and tries to lift the ball over Ashdown but the keeper stands tall and does well to make the save.
Free-kick taken by Hadji-Diouf around halfway and the delivery is good only for Tom Lees to head over.
Electrifying burst down the middle from Lennon and he plays a nice ball into Dempsey in the Leeds box. The American tries to beat Ashdown with a shot with the outside of his right boot but it is comfortably gathered.
Bale trying to make a nusiance of himself on the edge of the Leeds area after a looping ball from Huddleston but it bounces through to Ashdown.
Varney almost doubles his tally after good work down the left by Hadji-Diouf. Ross McCormack lays the ball back into Varney's path but he fires over the bar.
Kyle Naughton crosses from the right edge of the Leeds area after a Spurs break but Gylfi Sigurdsson can't get a decent contract with the header and it goes behind.
GOAL LEEDS: Varney breaks down the left after a flick on from Hadji-Diouf and is allowed to close in on the Spurs goal unchallenged before producing a neat finish to beat Friedel.
Good cross from the right by Byram and it bounces in the Spurs box dangerously but Friedel is off his line to gather.
Huddlestone taks the corner and Dempsey has a free header but he is off balance and it sails over the bar.
Good ball from Scott Parker releases Clint Dempsey on the right side of the Leeds box. He takes a look up and goes for the shot but drags it wide of the far post.
Nice ball finds Bale in the right channel bursting into the Leeds box but Lee Peltier does well to get the tackle in. Tottenham corner.
Steven Caulker clears under pressure from inside his own box and Leeds have another throw on the right.
Leeds get the game underway and an early throw-in to Spurs on the halfway line. They lose the ball and Luke Varney breaks down the left and forces a corner for the hosts.
A quick message from Sky Bet before the kick-off: "Tottenham have been attracting all the support ahead of kick-off and have consequently come in from 5/6 to 1/2. Leeds have drifted out to 5/1. Clint Dempsey leads the line for Spurs and is the 5/1 favourite to break the deadlock."
Charlie Newton is also excepecting Gareth Bale to play a starring role this afternoon: "I think Tottenham will bag this game 2-0 with bale scoring both."
Tottenham: Friedel, Naughton, Caulker, Vertonghen, Assou-Ekotto, Huddlestone, Lennon, Parker, Sigurdsson, Bale, Dempsey. Subs: Gomes, Dembele, Dawson, Walker, Livermore, Townsend, Obika.
Leeds: Ashdown, Byram, Lees, Peltier, White, Green, Austin, Brown, Varney, Diouf, McCormack. Subs: Kenny, Pearce, Tonge, Norris, Somma, Hall, Dawson.
Sky Bet make Leeds 5/1 to win this afternoon at Elland Road while Spurs can be backed at 1/2. The draw is on offer at 10/3 while the first goalscorer betting is headed by Jermain Defoe at 3/1.