Wigan substitute Franco Di Santo piled the pressure on Sunderland boss Steve Bruce with an injury-time winner in a 2-1 victory at the Stadium of Light.
The striker capitalised on Wes Brown's error to snatch victory as the visitors staged an impressive fightback.
Sebastian Larsson had given the Black Cats an eighth-minute lead, but Jordi Gomez levelled from the spot before half-time to set the stage for the late drama.
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