Manchester City are one game away from a historic treble after Ilkay Gundogan scored twice to beat Manchester United 2-1 in the FA Cup final on Saturday.Pep Guardiola's men completed a domestic double at Wembley and can become just the second side, after United in 1998/99, to win the Premier League, FA Cup and Champions League in the same season should they beat Inter Milan to become European champions for the first time on 10 June.As it happened | FA Cup final - Manchester City v Manchester UnitedGundogan scored the fastest goal in FA Cup final history after just 12 seconds.United levelled on 33 minutes through Bruno Fernandes' penalty after Jack Grealish was harshly penalised for handball.But the City captain, in what could be his final game for the club on English soil, volleyed home the winner six minutes into the second-half.The first ever major final between the Manchester giants had the most explosive of starts.Most of the 83,000 crowd were still taking their seats from the pre-match festivities when Victor Lindelof's headed clearance sat up perfectly for Gundogan to volley home a stunning strike after just 12 seconds.That appeared to set the tone for the Premier League champions.Rodri headed into the side-netting moments later before Erling Haaland failed to get a clean connection on Gundogan's enticing cross.United were barely able to get across the halfway line in the first half hour, but got the break they needed to get back into the game.Aaron Wan-Bissaka's header back across the City box brushed the arm of Grealish and referee Paul Tierney was instructed to review the incident by VAR.Despite City's protestations, Tierney pointed to the spot and Fernandes coolly sent Stefan Ortega the wrong way.The