Charlie Edwards produced a dazzling show to beat British rival Jack Bateson and win the ABA flyweight title in Liverpool on Sunday.
The 21-year-old rose to the occasion to earn a unanimous decision over the Leeds man as their eagerly awaited first meeting lived up to the hype.
The pair are friends on the full-time GB squad but have kept their distance since Bateson, a Sky Academy Sports Scholar, moved up in weight to challenge Edwards' 52kg dominance.
Edwards, who now looks certain to take the flyweight berth for England at the Commonwealth Games in July, said: "I showed everyone out there that I'm number one.
"There was definitely pressure on me because Jack was moving up and trying to take my spot, but I knew I had his number and I proved it to everyone out there."
Edwards edged the first round behind an accurate, rangy right-hand while the more composed Bateson pulled himself back into the bout in an action-packed second.
In a strong finish by both men, Edwards was caught by a couple of Bateson right hands but did enough to hold on for an impressive victory.
Birtley's flyweight Pat McCormack served up arguably the performance of the day as he crowned his first senior year with the ABA lightweight title.
The powerful 19-year-old, who won the junior world and European titles in 2011, was too strong for Leeds-based opponent Jack Daniel.
McCormack said: "I felt ready to step up to the seniors and I haven't felt much different. I am focused and determined to prove myself and get selected for the Commonwealth Games."
A quality 10-fight programme came to an end with a super-heavyweight war in which European bronze medallist Joe Joyce forced a third-round stoppage of Frazer Clarke.
World Championship bronze medallist Anthony Fowler delighted his home city fans by outpointing Darlington's Troy Williamson, and fellow Liverpool fighter Sam Maxwell beat Houghton's Josh Kelly for the light-welterweight title.