London: Ollie Watkins scored twice in three minutes as Aston Villa stunned Arsenal 3-0, leaving the London club with four losses from eight Premier League games.
The second-half goals from Watkins added to Bukayo Saka's own-goal in the 25th minute.
It was a quiet return to Arsenal for goalkeeper Emiliano Martinez, who left for Villa Park in the summer transfer window, as Pierre-Emerick Aubameyang endured another frustrating 90 minutes.
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The result takes Villa up to sixth in the table, three points off the lead and with a game in hand on all five sides above them. Arsenal dropped to 11th place a week after winning at Manchester United.
Villa thought they had opened the scoring with just 48 seconds on the clock as John McGinn brilliantly lashed home from inside the box.
The goal was eventually ruled out, however, after a lengthy VAR check deemed Ross Barkley had been stood offside and blocked goalkeeper Bernd Leno's view of the strike.