Park Ji-sung struck a stoppage-time winner to give Manchester United a 2-1 victory over Wolves.
United seemed set to be held by Wolves, who had equalised through old-boy Sylvan Ebanks-Blake midway through the second half after Park had put the hosts in front.
But Park, whose side had recovered from the loss of Owen Hargreaves less than five minutes into his first start since September 2008, would not accept anything less than victory and drove a near-post shot past Marcus Hahnemann to shatter Mick McCarthy's men.
The future of Hargreaves is again under scrutiny after the midfielder limped off with a hamstring injury. Bebe replaced Hargreaves and saw a shot bravely blocked by Richard Stearman.
United struggled to break down a Wolves side who were unlucky to fall behind just before the break.
Darren Fletcher provided the pass of the first half, cutting in from the left before splitting Wolves in two with a brilliant through ball that allowed Park to finish.
After a disappointing start to the second period, Wolves gained their reward for all their industry when Ebanks-Blake was in the right place to intercept a Nenad Milijas shot, turn sharply round Nemanja Vidic, then drive a fine shot through the legs of Edwin Van der Sar.
A golden chance then fell to Wolves replacement Steven Fletcher who found himself with a clear sight of United's goal following an ill-advised attempted clearance by Vidic.
Instead of calmly finding the net, the Scotland international rushed his chance and scooped it over.
Wolves thought they would at least be heading home with a point. Then Park cut inside the area from the right wing two minutes into injury-time, and drove his shot past Hahnemann at the near post.