Olivier Giroud opened the scoring for the visitors before own goals from Jack Cork and Kyle Naughton and an Alexis Sanchez strike sealed the victory
Arsenal moved up to third as they downed Swansea City 4-0 in Paul Clement’s first Premier League game in charge of the hosts on Saturday.
Olivier Giroud opened the scoring for the Gunners after 37 minutes before own goals from Jack Cork and Kyle Naughton gave the Swans a mountain to climb.
And Alexis Sanchez struck late on to add gloss to Arsenal’s victory at the Liberty Stadium.
Swansea dropped to the foot of the table following their defeat after fellow strugglers Hull City downed Bournemouth on the same day.