Olivier Giroud opened the scoring, but Benteke headed an equaliser after Wojciech Szczesny saved his penalty. Benteke controversially put Villa ahead from the spot after a foul by Laurent Koscielny, who was later shown a second yellow card for a mistimed challenge. New signing Luna raced clear to seal Arsenal's woe with a low strike. The full-time whistle was greeted with resounding boos from the home crowd, although the arena was near-empty by that point. It was Arsenal's first home defeat on the season's opening day in 20 years and only Villa's sixth victory in 28 league trips to the Gunners.