Assured in goal, saving well from Giroud, but was not often tested otherwise.
Like Maggio on the opposite flank, he put in a great two-way performance, defending with energy and attacking with real purpose. The only blot on his performance was a poor finish from a gold en chance in the second half.
Performed strongly when isolated against Giroud, often winning the ball against the French striker. Never looked in trouble at the back.
Dealt with the occasional threat from Arsenal well, but overall, this was not the most testing game from him.
Solid enough in the middle of the park, though he was visibly second best during a few spells of Arsenal pressure, and could do little to interrupt those periods.
Defended stoutly, closing down the likes of Ozil well, and was quick to release the ball to the flanks to take advantage of the overlapping fullbacks Armero and Maggio.
Strong and determined when defending his flank, and overlapped powerfully more than once, with a few motoring runs spelling trouble for the opposition defenders.
Try as he might, he could not get into his groove in the attacking third. Napoli looked a much better side in the offensive third once he was swapped out for Insigne.
Left unmarked a few times out wide on the left flank, but he could not make it count, proving a little wasteful on the ball when presented with an opportunity to do so. He did strike late with a composed finish, but it came with too little time to affect the course of the group.
Made a surprising number of tackles as his defensive work was praiseworthy, but like many of his team-mates, he could not produce consistently enough at the other end to aid his team's cause.
Once or twice, he threatened to escape off the ball, but those moments were few and far between. Not always able to hold the ball up well enough to supplement the build up. However, that was all forgotten when he slotted his side into the lead after a great turn.
Brave in traffic when coming from the ball, and could not be blamed for either Napoli goal.
Suspect positionally on a handful of occasions, particularly a run by Maggio that saw him nearly lob Szczesny from the edge of the box. Otherwise decent.
Given the slip by the energy of Armero once or twice, but his own engine was admirable, as he chased every ball, and always looked to push forward when needed.
Initially struggled against the pace and movement of the opposition, but began to perform more in his usual composed manner as the match wore on. However, he was found out late on once again, as Higuain turned him with ease for the opener.
Covered well for Mertesacker more than once, using his quick burst of speed to good effect to chase down and harry the Napoli runners. An assured display from the Frenchman.
Relished the physical confrontations as usual, and made sure that his presence was felt with a few crunching challenges. Covered every blade of grass.
Put in an admirable defensive shift as always, but could not always get up to his usual level when on the ball in the attacking third.
Another substandard game from the Spaniard, whose passing was not always up to scratch, and he created little in the way of chances. Subbed in the second half as Wenger went for a more forceful presence in the middle.
His off the ball movement was always admirable, but on the ball, he could not muster much to cause problems to the Napoli defence, apart from one feed for Giroud. Began to tire late on, which did not help his team defend their tenuous qualification hopes.
Generally assured in possession, and willing to work towards the cause off the ball, but there were one or two moments when his dwelling on the ball caught him out and allowed Napoli to attack. He nearly cost his team a place in the knockout stages with two avoidable bookings that left the Gunners a man down.
Toiled relentlessly as ever at the top of the box, and in addition to some sterling defensive work, he managed to test Cabral with one snap shot. However, the Gunners could have possibly done with a more rounded presence up top on a few attacks, as he did not always look in total control of the ball.