The hosts took the lead after six minutes in bizarre circumstances, Lacazette neatly back-heeling home a pass from Mkhitaryan while the rest of the Arsenal team were still appealing for a penalty after Lucas Torreira took a tumble. Arsenal doubled the lead 10 minutes later when Southampton keeper Angus Gunn, making his second Premier League appearance, cleared the ball straight into the path of Alex Iwobi. The Nigeria midfielder bolted forward and passed across goal to the unmarked Mkhitaryan, who thumped a low shot into the corner of the net. The win took Arsenal up to fourth spot on 53 points, one point ahead of Manchester United who were held to a 0-0 draw by Liverpool at Old Trafford. Southampton remain a point below the safety zone with 24 from 27 matches. The Gunners stretched their unbeaten home league record to 13 games since they lost to Manchester City in their opener on Aug. 12. While they have now won their last seven league matches in a row at The Emirates, their away performances have been patchy. Liverpool took over at the top of the Premier League table despite being held to a 0-0 draw against Manchester United on Sunday. Juergen Klopp’s side now have 66 points from 27 games while second placed Manchester City have 65 points from the same number of games.