The Black Cats fell behind in the 13th minute when Luke Cundle’s effort deflected off Luke O’Nien and past goalkeeper Anthony Patterson.
It was a tough first half for Tony Mowbray’s side as the hosts dominated possession and doubled their lead through Harry Darling on the stroke of half-time.
Sunderland pulled a goal back through Jack Clarke at the start of the second half but couldn’t salvage a point.
Our Sunderland writer Phil Smith has dished out his player ratings from the Swansea.com Stadium:
13. Amad (sub) - 6
Took plenty of shots on as his manager wants and got in some good areas - improved from Tuesday night. 6 Photo: Frank Reid
14. Abdoullah Ba (sub) - 5
Never really got into the game and made some poor decisions on the ball at times. 5 Photo: Frank Reid
15. Jay Matete (sub) - 6
Drove into some good areas at times but to no avail in the end. 6 Photo: FRANK REID PHOTOGRAPHER 2022