Theo Walcott scored twice in three second-half minutes as Arsenal came from behind to beat struggling West Ham 3-1 at Upton Park.
The England winger's quickfire double got Arsenal's title hopes back on track after a run of three Premier League games without a win and ensured London rivals West Ham dropped into the relegation zone.
Arsene Wenger's side had to respond to falling behind to Carlton Cole's 46th minute tap in following a mistake from Wojciech Szczesny.
Walcott levelled in the 68th minute with a shot that ought to have been kept out by Adrian, before sending a powerful header home after meeting a cross from the returning Lukas Podolski, who was introduced after Aaron Ramsey had hobbled off with a muscle strain.
Podolski himself sealed the win 11 minutes from time, marking his first appearance since August after a lay-off with a hamstring injury in style with a well taken goal from Olivier Giroud's lay-off.
Kevin Nolan returned from suspension as Sam Allardyce made four changes, while Arsenal midfielder Santi Cazorla came in for Tomas Rosicky (knock).
The hosts started strongly and Mark Noble tested Szczesny with a curling free-kick from the corner of the penalty area in the 10th minute.
Arsenal responded well and tested Adrian for the first time five minutes later, the goalkeeper leaping to his right to keep out Cazorla's powerful header from the edge of the box.
Mohamed Diame sent in a rasping drive from 30 yards which Szczesney gathered at the second attempt in the 25th minute. Walcott ought to have given the visitors the lead a minute later, when he volleyed wide from eight yards after being picked out by Ramsey's chipped pass.
Cazorla fizzed a 20-yard shot a foot over Adrian's crossbar before Giroud scuffed his shot wide 30 seconds later when through on goal.
The visitors continued to press for the opener, Mikel Arteta sending his volley a yard wide from the edge of the box a minute before the break.
But they were stunned when Cole put the hosts in front inside the first minute of the second period, turning home the rebound from seven yards after Szczesny had spilled Nolan's shot from the edge of the box.
West Ham had three clear chances to double the advantage in the next 10 minutes, Szczesny beating away Matt Jarvis' effort before Joey O'Brien and Cole were both guilty of missing the target from close range.
O'Brien headed wide when unmarked eight yards out, before Cole poked an effort of target from similar range.
Arsenal threatened an equaliser on the hour-mark, Adrian denying Cazorla before reacting smartly to keep out Mesut Ozil's follow-up with his legs.
The equaliser did arrive eight minutes later, Walcott cutting inside before scuffing a tame left-footed effort towards goal that Adrian somehow allowed to squirm through his grasp and into the net.
Three minutes later the turnaround was complete when Walcott headed home Podolski's left-wing cross to make it four goals in his last three matches.
Adrian rushed from his line to deny Podolski two minutes later, but the Germany international was not to be denied a goal as he lashed home a first-time effort to seal Arsenal's fifth win six visits to Upton Park.
|Coach: S. Allardyce|
for J. Collins 38'
for J. O'Brien 63'
for K. Nolan 75'
|UEFA Champions League Play-offs Review: Away sides prosper in play-off first legs|
|Fulham 0 Wolves 1: Sako inflicts more misery on hosts|
|Bundesliga Preview: Klopp set to break record as Dortmund host Leverkusen|
|Bruce reveals Aboubakar interest|
|Kane ready to light up Premier League|
|Jerome joins Norwich|
|Bayern destined to dominate Bundesliga once again|
|Perfectionist Guardiola raises the bar|
|Pohang Steelers 0 Seoul 0: Last-eight tie on a knife edge|
|Rojo pens five-year deal at United|
|Bayern Munich v Wolfsburg: Badstuber wary of tough opening|
|Eredivisie Preview: Ajax and PSV lock horns in De Topper, Groningen face Den Haag|
|Ligue 1 Preview: Bordeaux and Saint-Etienne out to continue dream starts|
|Thai Premier League Review: 10-man Buriram survive Muang Thong test, BEC Tero defeated|
|QPR seal Fer capture|
|Modric aiming for further glory after extending deal|
|Dzeko pens new City deal|
|Marotta: Vidal was never for sale|
|Evian v Paris Saint-Germain: Champions wary of wounded hosts|
|Ulloa gains confidence from debut goal|
|Hamann hoping for competitive Bundesliga|
|Dortmund duo Kirch and Ji sidelined|
|Irvine will not rush Gamboa|
|Messi, Mascherano laud La Masia|
|Moses: Hughes reason for Stoke move|
|Lahm aware of Dortmund threat|
|Atletico Madrid v Real Madrid: Rodriguez targets winning goal after opening Real account|
|Wilshere urges focus for return leg|
|Milan: No Liverpool offer for Balotelli|
|Michu chat aided Fernandez switch|
|Western Sydney Wanderers 1 Guangzhou Evergrande 0: Tempers flare after Sydney triumph|
|Van der Vaart headlines Netherlands squad|
|CAF Champions League Preview: Dead rubbers brought to life by Zamalek appeal|
|UEFA open Tavecchio investigation|
|Napoli sign Villarreal´s De Guzman|
|My heart is at Bayern, insists Muller|
|Altidore at his happiest - Poyet|
|Barca to go to CAS after FIFA rejects appeal|
|Swansea confirm Fernandez signing|
|Leverkusen will not relax, says Schmidt|
|Modric pens new Real deal|
|Amat relishing Fernandez competition|
|Snodgrass out for six months|
|Di Maria is Real´s best - Simeone|
|Kompany hails City contract dealings|
|Higuain: Napoli have to qualify|
|Martinez backs Barkley to bounce back|
|Stjarnan ready to exploit Inter´s ´weaknesses´|
|No price-tag pressure for Liverpool´s Markovic|
|Courtois admits departure thoughts|
|Skrtel: Liverpool must defend ´as a group´|
|Duff predicts Chelsea success, ´worried´ for Fulham|
|CONCACAF Champions League Review: Portland shine in Guyana|
|Simeone: We have a ´50-50 chance´|
|Copa Sudamericana Review: Cerro Porteno win away, Huachipato start strongly|
|Ronaldo injury ´not serious´ - Ancelotti|
|Martino names Argentina squad|
|Supercopa ´still open´ - Alonso|
|Expect goals in Lille, Porto clash - Girard|
|Courtois wants Cech stay|
|Benitez backs Napoli to score|
|Real Madrid 1 Atletico Madrid 1: Ronaldo off at half-time as Real denied|
|League Two Review: Morecambe, Burton remain unbeaten, Portsmouth defeat Northampton|
|Wenger rues ´unbelievable´ Ramsey dismissal|
|League One Review: Fleetwood maintain perfect start, Sheffield United off the mark|
|Championship Review: Forest stun Bournemouth, Maynard returns to haunt Wigan|
|UEFA Champions League Review: Higuain rescues Napoli, Leverkusen edge thriller|
|Besiktas 0 Arsenal 0: Ramsey dismissed in Istanbul stalemate|
|Al Hilal 1 Al Sadd 0: Al Faraj settles tight encounter|
|Al Kuwait 3 Persipura 2: Dramatic turnaround for defending champions|
|Al Qadsia 1 Al Hadd 1: Honours even in Kuwait City|
|Julio Cesar poised for Benfica after QPR release|
|Al Ain 2 Al Ittihad 0: Gyan strikes as Al Ain take first-leg lead|
|United agree Rojo deal|
|Vardy commits to Leicester|
|Hangeland ends Norway career|
|Let´s emulate the Brazil greats - Dunga|
|Dunga rings Brazil changes|
|UEFA Europa League Play-Off Preview: Inter, Villarreal hit the road|
|Lokeren v Hull City: Bruce set to rotate|
|Ha Noi T&T 0 Erbil 1: Radhi strike gives Iraqis first-leg advantage|
|AEL v Tottenham: Pochettino poised to make Euro bow|
|Pekerman signs new Colombia deal|
|Zubizarreta plays down Alves reports|
|Larsson targets more goal glory|
|Banega presented at Sevilla|
|Baptistao returns to Rayo|
|Zuculini seals Valencia loan move|
|Knee injury sidelines Schweinsteiger|
|Ideal start to title push - Terry|
|Ninh Binh 2 Kitchee 4: Visitors edge six-goal thriller|
|We will move on quickly, says Arfield|
|Conte aims to transform Italian fortunes|
|Redknapp eyes triple swoop|
|Conte dismisses Puma pressure|
|Barkley reports untrue - Martinez|
|Rossi a doubt for Serie A opener|
|Stjarnan v Inter: Icelandic minnows host Italian giants in Europa League play-off|
|My dream has come true - Suarez|
|I will not bite again, Suarez vows|
|Long happy with Southampton price-tag|
|Lambert slams disrespectful Koeman|
|Marin relishing Fiorentina loan|
|Everyone needs to chip in - Rodgers|
|Barcelona want fans´ pride - Luis Enrique|
|Popovic: Palace have not approached me|
|Rooney must work harder, says Hamann|
|Sigurdsson will be crucial - Williams|
|Prandelli sends best wishes to Conte|
|Cabella: I have more to offer|
|Brandao issues apology online before removing|
|Theophile-Catherine loaned to Saint-Etienne|
|Keller bemoans ´huge disappointment´|
|Hart to fight for spot|
|Costa hard done by - Mourinho|
|Liga del Futbol Profesional Boliviano Review: Blooming go top, The Strongest play out thriller|
|Rakitic keen to get to know Suarez|
|Rojo confirms United move|
|Argentine Primera Division Review: Racing Club, Velez Sarsfield stay perfect|
|Berg fires parting shot at UEFA|
|Mourinho hails calm Chelsea|
|Wenger: Play-off suits Arsenal|
|Sanchez swayed by Angel chat|
|DFB-Pokal Review: Schalke ousted, Hamburg scrape through|
|South Korea end Van Marwijk chase|
|Grinding win pleases Sturridge|
|Dyche upbeat despite Chelsea defeat|