Lee Haskins was forced to work for five rounds against Ryosuke Iwasa until a wonder shot in the sixth round set-up his first taste of world title glory.
Fighting in his hometown, Haskins, 32, produced a peach of a left hand that dropped Iwasa, and although the Japanese fighter managed to get up, the fight was all but over.
A follow-up flurry from Haskins was enough for referee Phil Edwards to step in to save Iwasa and hand the Briton the interim IBF bantamweight title.
In the co-feature, Bob Ajisafe claimed the vacant Commonwealth light heavyweight title with a fourth round victory over an out-of-depth Daniel Wanyonyi.
The 30 year-old Leeds man made it eight in a row without loss and pushed his record to 16-2 in the process. Wanyonyi was never fancied to be a threat and ultimately lived up to expectations.
Earlier, former British champion Darren Hamilton made a successful comeback from a brief retirement to triumph over Mikheil Avakyan on points over six.
Fledgling heavyweight Young Fury improved to 4-1 by scoring his third straight win since suffering a shock defeat to Henry Smith three months after turning professional.
The 19 year-old, who is six inches smaller than highly-ranked brother Tyson, predictably began his career in June 2014 with a stoppage, although lost out on points to Smith in September that same year. Fury seems to be well back on track though following his 40-37 victory over Jindrich Velecky in Bristol on Saturday night.
Also on the bill, super bantamweight Duane Winters improved to 2-0 by defeating Darren Pryce over four rounds, although Josh Baker was held to a draw by Matthew Ashmole who had previously lost 25 bouts and is without a win to his name.