West Ham 1 Arsenal 5
Carroll 83, Özil 24, Alexis 72, 80, 86, Oxlade-Chamberlain, 84

Alexis Sanchez produced a masterclass in skilful attacking play with a classy second half treble which blew away sad West Ham at the London stadium. Mesut Özil gave the Gunners the lead after Alexis capitalised on an Angelo Ogbonna mistake to square for the German to open the scoring. Alexis then struck twice to give the Gunners a three goal lead after the break, with Andy Carroll swooping after Dimitri Payet’s free kick came back off the woodwork. The hoped for Hammers comeback didn’t materialise as Alex Oxlade-Chamberlain added a fourth from range for the Gunners. He then turned provider with a through ball for Alexis to latch onto before producing a brilliant piece of play, feigning a shot to deceive the backtracking Hammers defence as well as ‘keeper Darren Randolph to complete a memorable treble. The win takes Arsenal up to second in the Premier League table on 31 points and they will stay there pending the result of Sunday’s Bournemouth’s hosting Liverpool.

Arsenal arrived in the east end on the back of a 12 Premier League game unbeaten run, and will recall last season’s encounter when they let a 2-0 half time lead slip for what turned out to be a 3-3 draw. That scenario never looked likely here. The Hammers lost James Collins early on through injury, with Alvaro Arbeloa replacing him.

The Gunners’ first foray saw Nacho Monreal race away on the left to cross, but with the goal exposed, the danger was cleared by Ogbonna. Monreal again threatened after Özil and Alexis interplay set up another cross, and again relief for the home side as the danger was cleared by Winston Reid’s last touch. Lanzini then broke out and had a sighter of Petr Cech’s goal, but under pressure from the recovering Laurent Koscielny, forced Cech to palm away for a corner.

A poor clearance by Ogbonna which came back off Francis Coquelin, and Alexis was swiftly on the ball. He eased past Reid and squared for Özil for an easy tap-in after 24 minutes. It was Özil’s eight goal of the season.

Only a goal in it at half time, and the Hammers came out for the second half looking to level. An intense sequence of play which saw Payet feed Lanzini, but Koscielny stood firm, as Fletcher lurked behind him, and then Fletcher himself fire narrowly past Cech’s upright from Reid’s raking pass.

The Gunners response was not long in coming. Oxlade-Chamberlain and Monreal crafted a move which saw substitute Aaron Ramsey test Randolph and the Hammers’ keeper then produced a reflex save to Özil’s follow up.

Arsenal increased their lead when Shkodran Mustafi found Alexis, and the Chilean had only one thing on his mind. He smartly turned his marker before powerfully driving and finishing low past Randolph for his 11th goal of the season. If that was a thing of beauty, more would follow.

Arsenal were in control and looked comfortable. Almost out of nothing they were 3-0 up after 80 minutes. Özil fed Granit Xhaka and his deflected pass fell right for Alexis.

The Arsenal number 7 glanced up briefly and saw claret and blue defenders in front of him. No matter though as he rifled home right footed from the 18 yard line for a 3-0 scoreline.

Carroll’s ariel menace had caught the Gunners out last season and briefly gave the Hammers a tiny flicker of hope when Mustafi felled Ayew 20 yards out. Payet hit the bar with Cech rooted to the spot. The Arsenal defence were slow to respond and Carroll headed in on his comeback for his first goal of the season.

The Gunners response was immediate. From a cross field ball from emergency right back Gabriel, Oxlade-Chamberlain picked up to left fly with a curling effort which proved to be too good for Randolph. 4-1 to the Arsenal, but still they saved the best was for last.

Ramsey put in Oxlade-Chamberlain. The England man threaded a precise pass to Alexis. With Reid now the wrong side of the Arsenal striker and Randolph exposed, the Chilean feigned to shoot. Reid and Randolph were now chasing shadows as Alexis produced a delicious dinked shot for Arsenal’s fifth goal and a thoroughly well deserved win at the London stadium.

The Gunners have now extended their run to13 unbeaten games in the Premier League and will look to continue that sequence when Stoke City arrive at the Emirates stadium next Saturday.