London - Discarded striker Danny Welbeck returned to haunt Manchester United by scoring the winning goal as Arsenal reached the FA Cup semi-finals with an enthralling 2-1 victory at Old Trafford on Monday.
England international Welbeck, who joined the Londoners last summer after his United career stalled, pounced on a horrendous back pass by Antonio Valencia in the 61st minute to send the holders through.
In a rip-roaring first half Nacho Monreal's cool finish put Arsenal ahead in the 25th minute but Wayne Rooney's diving header evened it up four minutes later.