Josh Warrington realised his world title dream at his beloved Elland Road by upsetting Lee Selby to clinch the IBF featherweight crown via split decision after a 12-round thriller.
Fervent Leeds supporter Warrington was roared into the ring by an expectant crowd estimated to be around 25,000 in his home city.
Warrington was a clear underdog with the bookmakers against his Welsh opponent but rose to the challenge in the West Yorkshire cauldron to maintain his perfect professional record and end Selby's near three-year reign as world champion at 126lbs.
Warrington was given the nod by two of the judges - 116-112 and 115-113 - with a third scoring the fight 115-113 in Selby's favour.
Another domestic dust-up may loom for Warrington as the winner of this bout had been heavily linked with Northern Ireland's Carl Frampton, whose next fight has been slated for Windsor Park later this summer.
Frampton - who, like Warrington, is promoted by Warren - was ringside in Leeds to witness the unexpected result.
An emotional Warrington thanked the people of his hometown for their raucous support, but admitted the pressure of challenging for a world title in Leeds had added an extra dimension to his training.
He told BT Sport: "I really can't put it into words. I've worked hard over the last 18 weeks.
"I got into this ring tonight with the expectation of this city on my shoulders.
"I've overcome with emotion. We worked on game plans but that all went out of the window and it was sheer grit and determination and this crowd got me through tonight."
On the prospect of next challenging Frampton in August, Warrington added: "I said to him two weeks ago, 'I'm going to beat Lee Selby then I'll come to Windsor Park'.
"We love an away day, me and the boys, so we'll turn up wherever, but first things first I need to sit down with my manager and Frank and then we'll get the fight sorted."
Earlier in the night...
Nicola Adams moved a step closer towards fighting for a world title after a stunning first-round knockout of Soledad del Valle Frias in her home city.
The two-time Olympic flyweight champion was facing her toughest test in her fourth fight as a professional but she came through with flying colours.
Fighting at Elland Road, on the undercard of fellow Yorkshireman Josh Warrington's clash against Lee Selby, Adams ended a scheduled 10-round contest early with a fierce left to the body on the bell, with her Argentinian opponent counted out.
After the bout, Adams told BT Sport: "I'm really happy to have been able to put on a good performance tonight."
On her chances of securing a world title fight, her promoter Frank Warren said: "I think she'll be fighting for a world title very, very soon. Sooner rather than later.
"She's had a tough year and she's done brilliantly to be where she's at so now it's all about onwards and upwards and we're working very hard to make sure she gets that title fight."
Adams added: "I'd love to be able to do that here in Leeds, it would be unbelievable."