Arsenal strolled to a much-needed win as Shkodran Mustafi, Pierre-Emerick Aubameyang and Henrikh Mkhitaryan saw off Watford 3-0 at the Emirates Stadium and Petr Cech kept his 200th Premier League clean sheet.
The Gunners had a fine early chance to take the lead at a sparsely-populated Emirates when Mesut Ozil found Aubameyang but the striker fired straight at keeper Orestis Karnezis.
Richarlison then shot into the side netting for Watford before Arsenal made the breakthrough after eight minutes when Ozil's cross was headed powerfully home by Mustafi.
The visitors responded well and Abdoulaye Doucoure blasted an effort that Cech parried before the Gunners came forward once more and an Ainsley Maitland-Niles cross was headed over by Alex Iwobi.