The Gunners secured their 13th win in 19 outings thanks to Olivier Giroud’s 65th-minute header from a Theo Walcott free-kick for his eighth of the campaign.
Sitting on 41 points, just one behind Arsenal, are premiership favourites Manchester City who are on a winning run of four and an unbeaten streak of eight after edging Crystal Palace 1-0 at the Etihad Stadium on Saturday.
Edin Dzeko scored the only goal of the match when slotting home Jesus Navas’ low cross in the 66th minute.
Seamus Coleman and on-loan striker Romelu Lukaku scored either side of Gaston Ramirez’s 71st-minute equaliser.
Elsewhere, Manchester United made it four wins in a row when edging Norwich City 1-0 at Carrow Road thanks to Danny Welbeck’s second-half goal, Aston Villa and Swansea City drew 1-1 at Villa Park as bottom-of-the-table Sunderland scored twice late to force a 2-2 draw at Cardiff City.
19th-placed West Ham United twice blew a lead to be held to a 3-3 draw by West Bromwich Albion in a fascinating encounter highlighted by a brace from Nicolas Anelka, Hull City turned it on with an emphatic 6-0 demolition job of Fulham at the KC Stadium to move to tenth as seventh-placed Tottenham recorded their first home win in five outings by comfortably accounting for Stoke City 3-0.
2013/14 Barclays Premier League scores
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