Walcott and Welbeck hit five past lacklustre Southampton

Theo Walcott's hat-trick helped Arsenal coast past Southampton 5-0 and into the FA Cup fifth round, with Danny Welbeck also scoring his first goals in eight months.

Welbeck netted twice in just his fourth outing since a second bout of serious knee trouble, before Walcott stole a treble as the Gunners thumped the lacklustre EFL Cup finalists at St Mary's.