Ballyglasheen produced a late burst to sink the dreams of Barizan, Vibrato Valtat and a host of ticket holders remaining in the mammoth scoop6.
The story of the pot rollover may overshadow the performance of the four-year-old but this represented another remarkable training performance from Evan Williams who is making a habit of landing big prizes at Haydock Park.
Williams sent out Barizan to win the race last year and it appeared as though he was going to follow up for his new handler, Donald McCain, with Vibrato Valtat again finding less than threatened off the bridle despite Sam Twiston-Davies' best efforts.
However, Paul Moloney somehow conjured one final burst from the juvenile - who had beaten Triumph Hurdle runner-up Kentucky Hyden at Cheltenham in December - with the pair going on to score by a length and a half at 25/1.
Winning owner Roger Gambarini, based near Newport in Wales, was enjoying a few days away playing golf, but was determined to fly home to see his pride and joy compete in the feature event on the final day of jumps racing at Haydock until November's Betfair Chase meeting.
Gambarini said: "I was in the bar in Portugal until midnight and flew over at 3.30am. The wife told me I was silly - she was wrong!
"Evan is never bullish about his horses. When he says they have no chance that is when you want to back them. I knew he would battle. I can't think of a bad race he's ever run and I knew he would finish well as he always does.
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"He was badly hampered in the Fred Winter at Cheltenham and I'm convinced he would have won, but I'm very happy to have won today.
"I'm not sure what the plan will be for him now. We might try and find a little race on the Flat for him somewhere.
"Evan was meant to be driving me back to the airport after racing but he remembered at the last minute he had a wedding to go to."
Moloney said: "He's a lovely little horse and never knows when he's beaten. Every time he's won for us he's looked beaten, but he loves a target so I was pleased to have a couple after the last (hurdle)."