The 24-year-old Londonder improved to 18-1 (17 wins inside distance) by powering his way to a fourth-round stoppage at Casino Miami on a Don King show televised live by BT Sport in the UK.
Dubois in control early
Dubois was in charge right from the start while Bryan (now 22-1) offered little in the way of response. Daniel though did not rush, preferring to feel his way into the fight before really starting to unleash the heavy power shots he is famed for.
A brutal flurry from ‘Dynamite’ in Round 3 had Bryan in real trouble, before a savage left hook in the fourth closed the show.
“The only words are ‘and the new’ and I am just so glad it is now,” said a delighted Dubois afterwards.
“It is happening now and we have made it real, my dad and my family, I’ve done everyone proud, the country and I can’t wait.
“In the first round I was just trying to figure him out and see what he had. I said I was going to test the chin and I just went for it.
“He brought out something in me, he brought out a wicked left hand! It was a punch-perfect ending and I am just so happy. I had a few rough patches during this camp, but we pulled through and we got the victory.”
Daniel targets huge fights now
Now Dubois is looking for really big fights – he will now be the mandatory for the winner of the Oleksandr Usyk vs Anthony Joshua title for the more accepted WBA super title.
“I am just so happy to have got this world title. This is what all the hard work was for and, no disrespect to Trevor, but his 0 had to go and I was just in there on a demolition mission.
“I am ready for whoever is next. I believe this will instantly make me a better fighter now. When you win the world title they say you become next level so names like Dillian Whyte and Joseph Parker are all on my hitlist. I will fight whoever Frank puts me in with next.
“It has been amazing. Coming out here and winning a world title is what I dreamed of as a little kid and now it has finally happened.”