Match ends, Manchester United 3, Arsenal 2.
Teenager Marcus Rashford scored twice and set up the third as Manchester United derailed Arsenal's Premier League title challenge at Old Trafford.
Rashford, who scored twice on his debut against FC Midtjylland on Thursday, steered in a loose ball for the opener then headed in three minutes later.
Danny Welbeck nodded Arsenal back into the game, but Rashford picked out Ander Herrera whose shot was deflected in.
Mesut Ozil's volley gave third-placed Arsenal hope, but United held on.
Arsenal - who have not won the title since 2004 - remain in third place, five points adrift of leaders Leicester having now played the same number of matches.
The Red Devils moved back into fifth position with their first win in three league games.
Do Arsenal actually want to win the title?
That's the question posed by former Manchester United and England defender Rio Ferdinand. Of course, Ferdinand is being facetious. And of course Arsenal want to win the title.
But, against an under-strength and youthful home side, the Gunners blew another opportunity to demonstrate their title credentials.
And it ended a miserable week for the Frenchman, who saw his side falter in three competitions.
Wenger watched his team labour to an FA Cup draw against Championship side Hull, then put themselves on the brink of a Champions League exit at the hands of Barcelona.
"This is a fight where you keep going even when disappointment is there. Let's show we are prepared for the fight," he said.
Rashford makes his Marc again...
Barely anyone outside Old Trafford had heard of Marcus Rashford less than week ago - now the teenage United striker is a household name across the country.
Two goals on his senior debut in the Europa League against Midtjylland catapulted him into the national spotlight.
But, many asked, how would he fare against a league title-chasing side in the heat of a battle between two fierce rivals? Coolly, calmly and clinically, as it turned out.
Rashford showed signs of his youthful exuberance in the early stages, darting inside a pair of Arsenal defenders from the left touchline before being hauled down on the edge of the penalty area.
The opportunity of that set-piece was not taken by the Red Devils, but it mattered little as Rashford soon put them into a two-goal lead.
The young Mancunian pounced on a poor clearance by Arsenal centre-back Gabriel to slot in his first Premier League goal, then waltzed into space to powerfully head in Jesse Lingard's floated cross.
But it was not just his finishing that caught the eye. Rashford showed great awareness and composure to pick out the run of Herrera, whose 20-yard shot took a wicked deflection off Arsenal defender Laurent Koscielny.
No wonder he was given a standing ovation from the Old Trafford crowd when he was replaced in the 80th minute.
|Former England winger Trevor Sinclair on BBC Radio 5 live:|
|"It's not just about the goals with Marcus Rashford. He has a cultured touch, his awareness is great and his link play is very good.|
|Something else impressed me too; the way he went to close down Petr Cech when the Arsenal goalkeeper received a back pass.|
|"Most young players would just close down the keeper, but Rashford shut off the pass out as well, and Cech ended up giving away the ball. That tells me he has been coached properly."|
Van Gaal takes a tumble
Manchester United manager Louis van Gaal fell over in front of the fourth official in what was described as "the comedy moment of the season" by BBC Radio 5 live commentator Conor McNamara.
The Dutchman, who rarely leaves his seat in the dugout during matches, appeared to be frustrated by an alleged dive by Gunners striker Alexis Sanchez.
"I have had a lot of criticism because I am sitting on my bench and now I am off my bench and I have lot of criticism because I'm doing that," Van Gaal said.
Grim up north for the Gunners...
Arsenal have not enjoyed their Premier League visits to Old Trafford in recent seasons, failing to pick up three points there since September 2006.
And many felt the Gunners needed to finally win at Old Trafford if they are going to end an even longer barren run - becoming the English champions.
The opportunity to beat United was probably the easiest for Arsenal than any other time during Arsene Wenger's 20-year reign.
But their defensive errors cost them dearly.
"I cannot fault the commitment and desire but unfortunately we conceded two easy goals," said Wenger afterwards.
Man of the match - Marcus Rashford
Stats of the day
- Rashford, aged 18 years and 120 days, is exactly the same age as Wayne Rooney was on the day that they both scored their first Premier League brace
- Rashford is one of only six players to have had a hand in three goals on their Premier League debut
- Arsenal have won none and lost seven of their past nine league trips to Old Trafford
- Mesut Ozil assisted for the 18th occasion this season in the league - only Thierry Henry (20 in 2002-03) has more in a single campaign
- Ozil scored and assisted in the same league away game for only the second time
- Arsenal have only won two of their past eight league away matches (W2 D3 L3) - this following a run of 12 away matches where they won 10
- Manchester United have now won back-to-back Premier League home games for the first time since September
A couple of days rest and then straight back into Premier League action. The top flight reconvenes for a full midweek programme, with both teams facing home matches on Wednesday.
Arsenal look to bounce back against 16th-placed Swansea, while United welcome 10th-placed Watford.
- 1de Gea
- 30VarelaBooked at 9mins
- 16CarrickBooked at 22mins
- 5RojoSubstituted forFosu-Mensahat 55'minutes
- 21HerreraBooked at 72minsSubstituted forWeirat 90+5'minutes
- 39RashfordSubstituted forJanuzajat 80'minutesBooked at 90mins
- 34CoquelinSubstituted forElnenyat 70'minutesBooked at 73mins
- 16RamseyBooked at 71mins
- 23WelbeckSubstituted forIwobiat 83'minutes
- 11ÖzilBooked at 90mins
- 14WalcottSubstituted forGiroudat 63'minutes
- Craig Pawson
- Shots on Target
Second Half ends, Manchester United 3, Arsenal 2.
Substitution, Manchester United. James Weir replaces Ander Herrera.
Adnan Januzaj (Manchester United) is shown the yellow card for a bad foul.
Laurent Koscielny (Arsenal) wins a free kick in the defensive half.
Foul by Adnan Januzaj (Manchester United).
Mesut Özil (Arsenal) is shown the yellow card for a bad foul.
Foul by Mesut Özil (Arsenal).
Guillermo Varela (Manchester United) wins a free kick in the defensive half.
Foul by Aaron Ramsey (Arsenal).
Jesse Lingard (Manchester United) wins a free kick in the defensive half.
Mohamed Elneny (Arsenal) wins a free kick in the attacking half.
Foul by Morgan Schneiderlin (Manchester United).
Corner, Manchester United. Conceded by Alexis Sánchez.
Foul by Mohamed Elneny (Arsenal).
Jesse Lingard (Manchester United) wins a free kick on the right wing.
Attempt saved. Laurent Koscielny (Arsenal) header from the right side of the six yard box is saved in the top centre of the goal. Assisted by Mesut Özil with a cross.
Alexis Sánchez (Arsenal) wins a free kick in the attacking half.
Foul by Guillermo Varela (Manchester United).
Substitution, Arsenal. Alex Iwobi replaces Danny Welbeck.