In the second half, Sunderland battled vainly to try to find a way back into the game, but the only goal they managed came at the wrong end as Jason Denayer put the ball into his own net.
Substitute Shane Long completed the rout two minutes into stoppage time to leave Southampton in 11th place in the table while Sunderland remained bottom.
(Reporting by Philip O'Connor, editing by Ed Osmond)
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