1' 
KICK OFF Arsenal get us started.
1'
Arsenal's title ambitions might have been derailed recently, but they can give Chelsea a huge lift with victory today.
2'
An early sight of goal for Jack Wilshere after some excellent approach play. Theo Walcott's cross causes chaos and falls to Wilshere, who drags a left-footed shot wide with Rio Ferdinand closing him down.
3'
Free kick to United, Aaron Ramsey tripping Anderson in the centre circle.
4'
Nani with an ambitious effort after cutting inside Gael Clichy. His drive from the corner of the box is high and wide.
5'
Arsenal are seeing plenty of possession, as you would expect. United are defending well though.
6'
Van Persie attempts a header on goal from Samir Nasri's cross which loops well over the crossbar.
7'
A positive start from Arsenal. Clichy breaks down the left and whips in a good low cross for Walcott to side-foot over the bar.
8'
Wayne Rooney sprays a long ball upfield with Javier Hernandez making a break. The Mexican is halted by an offside flag.
9'
Corner to Arsenal after a neat one-two between Walcott and Wilshere...
10'
The short corner is a waste and Nani eventually brings the ball clear for United.
11'
Patrice Evra with a well-shaped pass down the channel for Park Ji-Sung. Szczesny is quick off his line to gather the ball.
12'
United have started to come into the game after Arsenal had the upper hand in the opening exchanges.
14'
A vital interception from Evra! Wilshere with an excellent burst into the United box, his low cross looks for Walcott who would've had a tap in, but Evra concedes the corner!
14'
A poor corner from Arsenal, who really have very little aerial presence in their team.
15'
Clichy feeds Nasri down the left, but the winger is offside.
16'
The tempo of the match has tailed off since Arsenal's bright start.
18'
Wilshere goes down on the edge of the area after being released by Nasri. The England midfielder was never going to get to the loose ball, but he was certainly hauled down by Vidic.
19'
Wilshere finding plenty of space, but as he tries to attack he gifts possession to Fabio.
20'
Fabio involved again, this time at the other end! He walks into the Arsenal penalty area with alarming ease, and as he looks for Hernandez, Arsenal are able to clear for a corner.
21'
The corner breaks for Park, who sees his shot well charged down.
22'
United enjoying a little more possession. Anderson attempts to play in Park, but his pass is poor and runs through to Szczesny.
23'
Arsenal's attack breaks down as Clichy plays a harmless long ball into the arms of Van der Sar.
25'
25 minutes gone and it's still goalless. Who can make the breakthrough?
26'
Arsenal have had the better of the ball and the better of the opportunities, but neither goalkeeper has been tested.
27'
Wonderful play from Ramsey and the Welshman plays in Sagna, who is in an excellent position to cross. Sagna scuffs his attempt pathetically and the chance has gone.
28'
Arsenal attempting to play very intricate football and it's getting very congested on the edge of the United penalty area. You sense the home team might be running out of ideas.
29'
Wilshere impedes Michael Carrick and it's a free kick to United.
30'
A rather drab opening half hour. Surely it has to get better?
31'
Fantastic defending from Vidic, or was it? Walcott whips in a devilish delivery which Van Persie looks set to nod home. Vidic clears, but on second viewing it was clearly with his hand!
32'
United defend the corner and have they have got away with it. That was a definite handball and should have been a penalty to Arsenal.
33'
Fabio with a lung-busting burst forward, Koscielny is across well to put the ball into touch.
34'
A weekend of controversy seems to be ending with a doozy. That was a stone-wall penalty and not many on the pitch seem to have noticed it.
35'
At least it provided a moment of excitement in a game that has been slightly dull.
37'
Ramsey looks to slalom his way through the United defence, but Ferdidand does well to get his foot in and clear.
38'
Wayne Rooney's first sight of goal, his 25-yard shot deflected wide for a corner...
39'
Van Persie rises well to head clear at the near post.
40'
 Wayne Rooney is the first man in the book for bringing down Wilshere as he sprinted clear.
41'
Clichy wins a foot race with Nani to gather the ball for Arsenal, only for Koscielny to gift it to Anderson. Nani then feeds Rooney, whose low cross evades everyone and runs out for a goal kick.
42'
A chance at the end of the half for United. Park is a whisker away from getting on the end of Nani's cross, before Anderson curls a weak effort into the arms of Szczesny.
43'
Of the two teams, United will be the happier to get to the break goalless. But Arsenal have been OK, and will hope for a little extra in the second half.
44'
A late set piece for United, Clichy tripping Nani out on the right...
45'
Van Persie heads clear in defence again and United are frustrated.
45'
HALF TIME It's goalless at the break, the big controversy at half time is around that Vidic handball from Walcott's cross.
45'
So Arsenal on top territorially, and have created the few chances there have been, but we still await the breakthrough.
45'
Alex Ferguson will be pleased his team have got to half time level. A point would be a decent enough result in the title race.
45'
Not much for United to get excited about in that first half, but they will be very glad to still be level ahead of the second period.