Arsenal’s set pieces proved crucial once again today as they once again mastered the art of scoring from dead-ball situations. A lot has been made of Arsenal’s ability to score from them this season and in the first 45 minutes, they once again did the business as an own goal then a Kai Havertz header had them cruising. For Mikel Arteta, these sorts of details are what makes him tick and he has seen his team enjoy huge success from dead-ball positions all season long. Of course, key to Arsenal being so good from set-pieces has been the appointment of a specialist set-piece coach. READ MORE: Roy…