Arsenal doubled their lead nine minutes later when Alexandre Lacazette's shot was blocked, Ozil drove home the ball from the edge of the area and they looked like they were cruising to victory.
Newcastle substitute Ciaran Clark headed home a cross from Fernandez in stoppage time to throw his side a lifeline but they could not find another goal and fell to their fourth defeat in five Premier League games this season.
(Reporting by Philip O'Connor; Editing by Clare Fallon)
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