The striker deftly back-heeled a 51st-minute shot past advancing goalkeeper Simon Mignolet to double the lead skipper John Terry had given the visitors before the break.
Black Cats debutant Nicklas Bendtner had gone close with a 12th-minute header, but it was substitute Ji Dong-won who claimed a stoppage-time consolation strike with his first goal for the club.
Source: PA
Source: PA