Manchester United
David De Gea - 10/10
The perfect performance from the Spaniard today. His reflexes are almost supernatural and the only reason he wasn't able to keep a clean sheet is because his defence let him down. Gold.
Ashley Young - 8/10
Can't seem to make a wrong decision these days. On top of his game and his subtle hide-and-run effort to block an Ozil free-kick showed his intelligence - something Manchester United need this season.
Victor Lindelof - 7/10
Followed Alexis Sanchez around all first-half and did an excellent job of holding the Chilean but was prone to the occasional lapse in concentration in the second.
Chris Smalling - 7/10
Did well given the scoreline but in all honesty, had problems dealing with Lacazette's runs in behind.
Marcos Rojo - 6/10
Manchester United's poorest defender of the night. Couldn't handle the agility of both Lacazette and Sanchez and fouled his way to stop Arsenal. Not the morale-boosting performance he'd have liked.
Antonio Valencia - 8/10
A true Manchester United legend in the current squad. He's so good at the back and he's enjoying getting back to the attacking side of his game and his goal was an excellent shot megging two players in the process.
Paul Pogba - 6/10
His red card ruined an otherwise perfect performance from Manchester United. Will miss the key derby next weekend. An excellent assist for United's third, though.
Nemanja Matic - 8/10
Solid as always and with every game you see him play, you can't help but wonder what Chelsea were thinking of when they decided to sell him in the summer. Superb in midfield, as usual, and got an incredible block to deny Ramsey in the first half.
Anthony Martial - 8/10
That subtle flick to send Jesse Lingard through on goal was such a joy to watch. He's enjoying a rich vein of form and United are so much more dangerous with him on the team.
Jesse Lingard - 9.5/10
Completely a new player with his role now more of a central attacker and showed today with two good goals and an applaud-worthy contribution to getting back and defending as well.
Romelu Lukaku - 6.5/10
Don't remember him doing anything of use all game. His dip in form is starting to get worrying.
Substitutes
Ander Herrera - 6/10
Made only 4 accurate passes having been on the field for nearly 30 minutes and that shows you why his manager isn't starting him anymore. Just plain poor.
Matteo Darmian - 6/10
A very lucky man given he clearly brought Welbeck down late in the second half.
Marcus Rashford - NA/10
Didn't play long enough to merit a rating.