Arsenal scored twice in the last nine minutes to overcome in-form Watford and record their seventh straight win in all competitions.
With 10 minutes to go it appeared that the fourth-placed Hornets, with wins over Tottenham and Manchester United this season, would frustrate another Premier League giant.
But that was until the introduction of Alex Iwobimidway through the second half at Emirates Stadium.
The Nigerian’s driven low ball from the right resulted in Arsenal’s opener, inadvertently turned in by Watford’s Craig Cathcart.
Two minutes later Iwobi was involved in a one-two with Alexandre Lacazette, who delivered a low cross for Mesut Ozil to sidefoot home.
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