Manchester City scored three times in the last 10 minutes to seal a remarkable victory over United in the first Reserves derby of the season at Sports City.
A hard-fought clash was settled by goals from Emile Mpenza, Adam Clayton and Ashley Grimes, after Fraizer Campbell had deservedly put United ahead just after half-time.
The hosts piled on the pressure after Campbell's strike, however, and steamrollered the Reds after drawing level through Mpenza's scruffy leveller.
Bright spots for United included a 64-minute outing for Anderson, while Campbell's goal will undoubtedly be among the best goals scored by the Reds' second-string this season.
An entertaining first half saw the two teams evenly matched. The best chance of the half fell to Chris Eagles, who saw his shot saved after a lightning break involving Kieran Lee and Lee Martin.
Two minutes later, Sun Jihai flashed a cross-shot across the face of Tom Heaton's goal with City's closest call of the first 45 minutes.
Sam Hewson tested Richard Martin just after the interval with a swerving right-footed effort, which the goalkeeper spilled but just managed to gather in time.
Moments later Marc Laird was thwarted by a diving block from Adam Eckersley, who flung himself in the way of the shot and ensured parity remained.
Parity was only fleeting, however, as Campbell put United ahead in superb fashion, clinically finishing a nine-pass move after 52 minutes.
Martin was heavily involved in the move's infancy before spreading it wide to Eagles. The winger's first-time touch fed Hewson, who instantly slid the ball to the onrushing Campbell, who finished with aplomb.
City responded with a scuffed shot from Ashley Grimes, and Heaton was called into action by the same player on 65 minutes, saving well with his feet after Grimes had found space inside the area.
Moments earlier, Anderson had been substituted after a neat and tidy display in attack. The Brazilian showed a good understanding with United's youngsters, particularly Eagles.
United continued to threaten on the counter-attack, but it was Belgian striker Emile Mpenza who had the next clear chance of the evening, turning an awkward cross over the bar despite being unmarked.
The Belgian did find the net, however, in the 82nd minute as he deflected in Grimes' mishit shot from close range to draw the hosts level.
Two minutes later, City moved ahead. Substitute Adam Clayton headed Kelvin Etuhu's cross powerfully into the ground, and it eluded the despairing dive of Heaton before nestling in the corner.
And Grimes hammered the final nail into United's coffin four minutes from the end of normal time, firing in from close-range after Mpenza's shot had been cleared off the line by Adam Eckersley.
United: Heaton; R Eckersley, Bardsley, Chester, A Eckersley; Eagles (Dong, 81), Hewson, Lee, Martin (Barnes, 67); Anderson (Brandy, 64), Campbell.
Substitutes not used: Woods, S Evans.