Luka Milivojevic opened the scoring from the spot, before Granit Xhaka and Pierre-Emerick Aubameyang put the Gunners in front.
However, Milivojevic struck again from 12 yards with seven minutes left, after Wilfried Zaha was fouled in the area by Xhaka.
Speaking after the match, Emery told Sky Sports: “Because the last match away at Fulham we played like that with a good transition. With Danny and Laca I wanted to find a good transition between two good players,”.
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