Arsenal were denied victory by Martin Demichelis's late equaliser as they fought out an entertaining draw with Manchester City at Emirates Stadium. England striker Danny Welbeck made his Arsenal debut after his £16m move from Manchester United - and should have celebrated with a goal only to strike a post when clean through early on. Sergio Aguero made Arsenal pay for that miss by putting City ahead before half-time but goals from Jack Wilshere and Alexis Sanchez saw the Gunners in sight of a memorable victory.