Gallas saves Arsenal with his late, late goal and keeps Arsenal top of the league after Ronaldo thought he had won it in a pulsating second half.

Gallas pulls Arsenal level in stoppage time after a goal mouth scramble which resulted in Walcott firing the ball back across goal for Gallas to hook home despite Van der Sar's attempts to claw it away, the linesman flagging for the goal.

A long ball into the penalty area bounces over O'Shea's head for Eduardo who snatches at the ball first time, slicing it wide of goal with a dreaful finish.

Fabregas' resulting corner finds its way to Gallas at the far post who has time to bring the ball down and shoot but drags the ball wide of the goal.

Eduardo whips in a low cross which makes it all the way across the face of goal where Evra has the seemingly simple job of clearing it but nearly slices the ball into the back of his own net.

Ronaldo restores Manchester United's lead after Saha and Evra combined well down the left, Evra cutting the ball back under the on-rushing Almunia for Ronaldo in the centre who fired home into an empty net.

Arsenal make a double substitution with Eduardo Da Silva and Gilberto coming on for Tomas Rosicky and Alex Hleb

Giggs whips in a corner towards the near post looking for the run of Vidic but its cut out with a brave header from Sagna.

Walcott nearly catches Van der Sar cold with a deep cross looking for Adebayor but the cross nearly ends up in the back of the net, Van der Sar plucking it out of the air.

Louis Saha makes his long awaited come back from injury as the Frenchman replaces Carlos Tevez.

Arsenal make their first change of the game with Theo Walcott coming on for Emmanuel Eboue

Hargreaves has a go from a similar range as Anderson but this effort is even worst slicing it high and wide of the Arsenal goal.

Anderson tries his luck from a long way out, driving it low towards the bottom right hand corner but there isn't enough pace on the effort and Almunia saves easily.

Manchester United make the first change of the game with Wes Brown being replaced by John O'Shea

Hleb shows some wonderful foot work on the edge of the penalty area to lay it off for Rosicky who strikes the ball first time but with the outside of his boot and sends it wide of the target.

Arsenal's hesistation at the back nearly costs them after Evra gets himself forward and beats Almunia to the ball, trying to cut it back for Ronaldo inside the box but a sea of red shirts manage to cut the pass out and clear the ball away.

Hleb does well to get away from Brown and tries to cut the ball back for Fabregas but the Spainish wonderkid can only send the ball wide of the mark from six yards out.

Hleb has a shot from the edge of the box but is put off by the sliding challenge of Vidic, Hleb only managing to fire it high over the bar.

Rooney misses a golden oppurtunity from Ronaldo's little chipped cross, the England forward heading it well wide of the target.

Giggs whips in an outswinging corner for which Vidic reaches but can only send it back where it came from for an Arsenal goalkick.

Fabregas strikes the freekick under the wall, which jumped over the ball, but its easy for Van der Sar to deal with saving easily down to his right.

Clichy goes on another decent run into the United penalty area where his cross seemingly hits Hargreaves on the hand but Howard Webb waves away the Gunners protests.

Hleb and Eboue combine well down the right and Eboue tries to pick out Adebayor with a low cross but its cut out well by Ferdinand who hoofs it away.

Arsenal are really clicking into gear now, Flamini trying his luck from the edge of the penalty area but only succeeding in driving it over the bar.

Arsenal are back on level terms as Fabregas is the Gunners saviour again, some nice build-up play left Adebayor with a chance which Van der Sar saved but left Fabregas with the simplest of finishes slotting it past Bown on the line.

Manchester United get the second half underway hoping to hold onto this one goal lead and resist the red tide that will certainly begin to bare down on them as the half continues.

United lead the break after Rooney's late goal, the Red Devila just edging ahead after a tight first half in which neither side created much

Rooney gives United the lead after some good work down the right from Brown and Ronaldo, the Portuguese winger whipping the ball across the face of goal for Rooney who got ahead of Gallas to turn the ball in.

Cesc Fabregas goes into the book after a two footed tackle on Anderson which got nothing of the ball.

Rosicky tries his luck from the edge of the penalty area, trying to curl it past Van der Sar but its straight at the Dutch goalkeeper who saves easily.

Gallas wastes the best chance of the game so far after being picked out by a wonderful Fabregas freekick the Arsenal captain could only head it straight at Van der Sar who saves the header and then allows Evra to clear it away.

Giggs floats in a corner for United looking for Vidic but Toure gets up well to head the ball away from danger and launch an Arsenal counter-attack.

Ronaldo whips in a low cross from the right looking for the run of Rooney and nearly finds the England forward but the sliding challenge of Toure does just enough to block the shot.

Toure finds himself upfield and with a shooting oppurtunity but unfortunatly for the central defender the shot doesn't match the run and goes high over the bar.

Owen Hargreaves becomes the second United player to be booked after running through Fabregas in the centre of the pitch.

Rooney flicks a long ball for Giggs who is given too much time, the Welsh wizard turning and shooting just over the bar.

Neither goalkeeper has been called on so far as the ball seems permanently stuck in the middle of the park.

Ronaldo whips in a cross from the right which makes it all the way across the face of goal for Giggs at the far post who can't react quick enough ad just touches it wide from a yard out.

Patrice Evra becomes the first man to recieve a booking after chopping down Adebayor who had just got away from him.

Hleb just starts to get away from Vidic inside the United penalty area and the Serbian defender seems to pulls the midfielder down inside the penalty area but Howard Webb waves away the Arsenal appeals.

Rooney gets away from Eboue and fires in a low cross towards the near post looking for Tevez who can't control the ball and can only send it wide with his first touch.

Giggs swings in the first corner of the game and Ronaldo rises to meet the ball and nods it against the post but it doesn't matter as Howard Webb has already blewn his whistle, spotting an infringement.

Flamini and Anderson collide and the two midfielders go head-to-head as the temperature begins to rise here at the Emirates.

Clichy charges into the United half and tries his luck from about 25 yards but its a poor effort and trickles wide of goal.

A bright start from Arsenal who are pushing United back at the moment, Adebayor stabbing the ball through the visitors back line but there is too much on it and it runs out of play for a goal kick.

Referee Howard Webb gets this game underway here at the Emirates Stadium which Arsene Wenger has dubbed 'the big one'. Hope it lives up to the expectations as Arsenal kick-off

Manchester United XI: Van der Sar, Brown, Ferdinand, Vidic, Evra, Ronaldo, Anderson, Hargreaves, Giggs, Rooney, Tevez.

Manchester United make two changes from the side that beat Middlesbrough with Patrice Evra coming in for John O'Shea and Ryan Giggs replacing Nani.

Arsenal XI: Almunia, Sagna, Toure, Gallas, Clichy, Eboue, Flamini, Fabregas, Rosicky, Hleb, Adebayor

Arsenal are unchanged from the side that drew at Liverpool last weekend with Robin van Persie and Philippe Senderos still unavailable through injury.