Bukayo Saka is Arsenal's top scorer this season with 13 goals in all competitionsArsenal capped off a big week for their Champions League hopes by beating Manchester United to stay fourth in the Premier League.
Nuno Tavares capitalised on some poor defending to tap in the opener before Bukayo Saka converted a penalty.
Cristiano Ronaldo pulled a goal straight back on his return to the United side and Bruno Fernandes missed a second-half penalty for the visitors.
But Granit Xhaka's fine strike secured Arsenal's second win in four days.
More to follow.
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Line-ups
Arsenal
Formation 4-2-3-1
32Ramsdale
17Cédric Soares4White6Gabriel20Tavares
25Elneny34Xhaka
7Saka8Ødegaard10Smith Rowe
30Nketiah
32Ramsdale17Cédric SoaresSubstituted forTomiyasuat 90+1'minutes4White6Gabriel20TavaresBooked at 68mins25ElnenyBooked at 80mins34XhakaBooked at 67mins7SakaSubstituted forHoldingat 74'minutes8Ødegaard10Smith RoweSubstituted forMartinelliat 64'minutes30NketiahSubstitutes
1Leno9Lacazette16Holding18Tomiyasu19Pépé23Sambi Lokonga35Martinelli38Azeez69SwansonMan Utd
Formation 4-2-3-1
1de Gea
20Dalot2Lindelöf19Varane27Telles
39McTominay31Matic
36Elanga18Bruno Fernandes25Sancho
7Cristiano Ronaldo
1de Gea20Dalot2LindelöfBooked at 82mins19Varane27TellesBooked at 31mins39McTominay31MaticSubstituted forRashfordat 77'minutes36ElangaSubstituted forLingardat 77'minutes18Bruno FernandesBooked at 76minsSubstituted forMataat 84'minutes25Sancho7Cristiano RonaldoBooked at 90minsSubstitutes
3Bailly4Jones5Maguire8Mata10Rashford14Lingard26Henderson29Wan-Bissaka75Garnacho FerreyraReferee:Craig PawsonAttendance:60,223Live Text
Match ends, Arsenal 3, Manchester United 1.
Second Half ends, Arsenal 3, Manchester United 1.
Cristiano Ronaldo (Manchester United) is shown the yellow card for a bad foul.
Takehiro Tomiyasu (Arsenal) wins a free kick on the right wing.
Foul by Cristiano Ronaldo (Manchester United).
Substitution, Arsenal. Takehiro Tomiyasu replaces Cédric Soares.
Gabriel Magalhães (Arsenal) wins a free kick in the defensive half.
Foul by Jadon Sancho (Manchester United).
Substitution, Manchester United. Juan Mata replaces Bruno Fernandes.
Victor Lindelöf (Manchester United) is shown the yellow card for a bad foul.
Eddie Nketiah (Arsenal) wins a free kick on the left wing.
Foul by Victor Lindelöf (Manchester United).
Mohamed Elneny (Arsenal) is shown the yellow card for a bad foul.
Foul by Mohamed Elneny (Arsenal).
Scott McTominay (Manchester United) wins a free kick in the defensive half.
Substitution, Manchester United. Jesse Lingard replaces Anthony Elanga.
Substitution, Manchester United. Marcus Rashford replaces Nemanja Matic.
Bruno Fernandes (Manchester United) is shown the yellow card for a bad foul.
Nuno Tavares (Arsenal) wins a free kick in the attacking half.
Foul by Bruno Fernandes (Manchester United).
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