Man Utd knocked out of FA Cup by Brighton, Martinelli hits hat-trick for Arsenal

Manchester United crashed out of the FA Cup with a meek 2-1 home defeat to Brighton on Sunday as Gabriel Martinelli's hat-trick fired Arsenal to a 4-1 win at Portsmouth to reach round four.

United interim boss Darren Fletcher could only watch on in horror as the Red Devils' last chance of silverware this season and likely his chances of landing the job until the end of the season went up in smoke at Old Trafford.

Fletcher's men were left to rue not making more of a positive start before Brajan Gruda fired the visitors in front on 12 minutes from Danny Welbeck's cross.