Tony Mowbray’s side created the better chances in a goalless first half, despite losing captain Corry Evans to an injury.
The Black Cats then took the lead five minutes after half-time when Ross Stewart was awarded a penalty, resulting in a red card for Boro defender Dael Fry.
Stewart’s initial spot kick was saved by goalkeeper Zach Steffen, yet the striker was able to convert the rebound.
Amad then secured the win for the hosts when he beat Steffen with a low finish nine minutes from time.
Here’s how Phil Smith rated each Sunderland player at the Stadium of Light:
5. Aji Alese - 8
A surprise inclusion in the starting XI and what a return it was. Snapped into challenges, dominated in the air and sprang forward when he could. That he was forced off with injury was the afternoon’s biggest disappointment - hopefully it was more fatigue. 8 Photo: Frank Reid
6. Corry Evans - 6
Started steadily but picked up an injury when making a challenge inside the first ten minutes and was unable to run it off. 6 Photo: Stu Forster
7. Dan Neil - 9
Another superb display from Neil, who was dominant off the ball and moved it well throughout. Did tire a touch late on but it was another top-tier performance from a youngster who is blossoming at this level. 9 Photo: Martin Swinney
8. Patrick Roberts - 8
Split the game open with a truly glorious pass that forced the foul on Stewart and the red. Had threatened regularly before then. Irrepressible and played his part in the second goal, too. 8 Photo: Martin Swinney