Luke Littler fought back to win six of the last seven legs and edge out Mike De Decker to book his place in the quarter-finals.
Littler had been in fine form in Wolverhampton, coasting through his opening group, but De Decker recovered from a slow start to forge 8-4 ahead.
After De Decker then moved one away at 9-8, but Littler – who had earlier been on a nine-dart finish, but missed a treble with his seventh throw – dug in again to force a deciding leg.
With World Grand Prix champion De Decker sat on 170, Littler closed out 86 to seal a memorable comeback win.
“I don’t know if I enjoyed that. I’ve got to feel for Mike,” Littler said on Sky Sports.