Late goals from Tobias Hysen and David Connolly earned Sunderland a deserved win at struggling Leicester.
Leicester keeper Paul Henderson kept the Black Cats at bay until the 79th minute when Hysen turned the ball in after Daryl Murphy hit the bar.
The visitors were rampant and Connolly prodded home after Murphy was thwarted by the outstanding Henderson.
The Foxes struggled to create chances, with Levi Porter's sliced shot from 15 yards their best effort.
606 DEBATE: Give your thoughts on the match
Leicester boss Rob Kelly:
"I've got no complaints whatsoever. We were beaten by the better team on the day.
"We don't blame individuals and as a group we didn't perform anywhere near the levels we know we can but there wasn't a lack of effort.
"We won't brush it under the carpet because we can't. It was gut-wrenching for us."
Sunderland manager Roy Keane:
"I thought we'd get there in the end. We had to be patient and their keeper made some great saves.
"We showed great perseverance and desire and I think we could have had a few more goals.
"A few lads haven't been happy with me because they haven't had the chance to get involved and now is their chance to to stake a claim."
Leicester: Henderson, Stearman, McCarthy, Kisnorbo, Kenton, Hughes, Wesolowski (Cadamarteri 62), Williams, Porter, Fryatt, O'Grady (Hume 62).
Subs Not Used: Logan, Tiatto, Maybury.
Sunderland: Ward, Whitehead, Varga, Nyatanga, Wallace, Stephen Elliott, Yorke (Leadbitter 60), Miller, Hysen (Hartley 84), Brown (Murphy 59), Connolly.
Subs Not Used: Fulop, Welsh.
Goals: Hysen 79, Connolly 83.
Ref: S Mathieson (Cheshire).