Fast becoming a real fan favourite, Lacazette scored in the 20th and 67th minutes - the second of which came from the penalty spot - as Tony Pulis' men were made to pay for not taking their chances and ultimately outclassed.
Arsenal's Alexandre Lacazette celebrates scoring against West Brom
Image credit: Reuters
The match will be remembered as the one which saw Barry record his 633rd Premier League appearance as he surpassed Ryan Giggs' mark.
Arsenal's victory sees Arsene Wenger's side move up to seventh place, six points behind leaders Manchester City and United.
Should Rodriguez have stayed down? In getting to his feet as quickly as possible having been fouled and trying to score, Jay Rodriguez did the what you would call the right thing, but it perhaps wasn’t the smartest thing to do to help his side win. Had he stayed down it would have been harder for referee Bobby Madley not to give a penalty – which he absolutely should have given – plus Arsenal may well have been reduced to 10 men. It’s a convenient excuse for the Baggies, but it’s hard not to have some sympathy with them and wonder what might have been.
MAN OF THE MATCH
Alexandre Lacazette (Arsenal). He was signed to score decisive goals and he did just that. Nobody was hugely impressive for Arsenal, but Lacazette did his job and ultimately it was his efficiency - and West Brom's lack of efficiency - that separated the two teams.
Image credit: Getty Images
8 – CHANCE AND PENALTY APPEAL! A hopeful ball into the channel sets Rodriguez off and he's too fast for Mustafi, who ends up tripping him inside the box after the striker checks back onto his right foot. He gets up quickly though, perhaps too quickly, and shoots, only for Cech to tip onto the post. Livermore then puts the rebound wide - huge let off for Arsenal!
19’ – GOAL! Arsenal 1-0 West Brom (Lacazette) - Arsenal win another free-kick just outside the area. Sanchez takes, Foster just about claws it off the line but Lacazette reacted quickest and nods in the rebound.
38’ – OFF THE LINE! Krychowiak leads a West Brom break down the left and crosses for an unmarked Rodriguez, who heads beyond Cech, but Monreal gets back in the nick of time to clear off the line.
42’ – CHANCE! So close again for Rodriguez, this time seeing the ball fizz inches past his outstretched leg after Robson-Kanu had flicked on a Nyom cross.
66’ – PENALTY! Ramsey turns away from Nyom, does him for pace and just as he enters the box is bundled over. That one was easy for the ref.
67’ – GOAL! Arsenal 2-0 West Brom (Lacazette). Lacazette expertly dispatches the spot kick, sending it low to the goalkeeper's left and past Foster, who guessed correctly.