Goalkeeper and defence
Bernd Leno 6 - The German number one did not have much to do in the first-half, his only action was keeping Mason Greenwood out from a tight angle.
Hector Bellerin 8 - Most of the play went down the left-side for Arsenal. He won the penalty for the only goal of the game, in which Pierre Emerick-Aubameyang netted.
Gabriel 7 - The home side were playing on the counter-attack, The Gunners' defence were playing a high-line. The centre-half stifled the pacey United attack.
Rob Holding 7 - One of the quieter defenders, Holding returned to the side in a back three. He also played his part in nullifying the opposing attack.
Kieran Tierney 6 - Playing on the left-side of a back three, the Scot has adapted into this role pretty well. The bout against United was another example of his superb defensive capabilites.
Bukayo Saka 7 - The number seven saw a lot of the ball, his duels with Aaron Wan-Bissaka was an interesting match up.
Mohamed Elneny 8 - One of the better players for Arsenal. The Egyptian played his role superbly. He was linking defence to attack and covering a lot of ground for his side.
Thomas Partey 8 - The latest addition to the squad, he was a solid defensive unit in the midfield. His influence in the side will be evident during the season.
Willian 6 - The Brazillian put a shift in out on the wing. Depsite not having a huge impact, he did work hard. He wanted the ball, his confidence didn't drop despite not having the best game.
Alexandre Lacazette 5 - Leading the line for Arsenal, the Frenchman had limited chances at number nine. His one big chance came in the first-half, he failed to connect with the ball.
Pierre Emerick-Aubameyang 8 - Like his fellow forwards, the skipper had limited chances. His penalty in the second-half proved to be decisive.
Eddie Nketiah N/A - His involvement was little when he was introduced. United were pushing for a leveller, which meant Eddie did not see much of the ball
Ainsley Maitland-Niles 5 - The number 15 put himself about when he came on. His role would have been to put a shift in, be a menace and chase the ball in midfield.
Shkodran Mustafi 5 - Coming on to sure up the defence, the German kept it stubborn.