Elliot Embleton grabbed an 89th minute winner to ensure Sunderland would move back into the top six with five games to go. The Black Cats have a game in hand on promotion rivals Wycombe Wanderers and the win at Oxford lifts Alex Neil's side four points clear of Saturday's opponents.
The Black Cats academy graduate has been a mainstay in the Sunderland side this season but has seen his game time limited of late. His late winner at the Kassam continues Sunderland's run of late goals, prompting comparisons to Roy Keane's Black Cats side, 15 years ago.
Embleton told SAFC: "We knew it was going to be a tough game, they're the highest scorers in the league and good with the ball, so it was always going to be a tough game for us defensively. We dug in and got the result.