Swansea secured a fourth successive win in the Championship as they held off a spirited Sunderland fightback.
Ollie Cooper's first goal of the season gave Swansea the lead on 13 minutes as his deflected effort found the net.
Recalled defender Harry Darling doubled the advantage when he poked home a second in first half stoppage time.
Jack Clarke's fine run and finish gave the visitors hope, but Swansea held firm despite the visitors being the better side after the break.
The Swans remain in the Championship play-off spots after collecting 12 points from 12, while the Black Cats fall to 12th despite a spirited second-half display that almost saw them claim a share of the spoils.