Sadou Diallo scored in stoppage time as Wolverhampton Wanderers came from 2-0 down with 10 minutes left to win 3-2 at Manchester United and all but secure the Premier League 2 Division 2 title.
Wolves were top on goal difference going into the final round of matches, but Mason Greenwood gave Man Utd a 31st-minute lead at Leigh Sports Village before Angel Gomes made it 2-0 from the penalty spot shortly after half-time.
Wolves pulled a goal back with nine minutes remaining, a Lee O'Connor own goal, before Niall Ennis levelled on 88 minutes.
A brilliant finish from Diallo in stoppage time was the winner.
With Reading, in second, losing 2-1 at Stoke City, it means only a 12-goal win against Sunderland for third-placed Southampton can deny Wolves the only automatic promotion spot in Division 2.
Man Utd finish sixth on 30 points.
See: Man Utd report | Wolves report
Friday's other PL2 results