With new signing Albert Sambi Lokonga in action, the Gunners went back in front hen Lacazette scored a penalty after Ainsley Maitland-Niles was fouled.
Tierney smashed home a half-volley to extend the lead, but the goal from Azeez was the pick of the bunch.
The 18-year-old collected a short corner on the right-hand side of the Watford penalty area, shifted the ball onto his left foot and then curled a sublime effort into the top corner.
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