Eddie Hearn admitted his surprise that Leigh Wood was able to hold onto his title.
The 35-year-old came up against Josh Warrington on Saturday night and for the best part of seven rounds he appeared to be out of the running in the fight.
However with little remaining of the seventh, a brutal shot with his left rocked his opponent, and he then followed up with a flurry of blows that sent Warrington to the canvas.
While the fallen man beat the count, the referee decided to bring things to a stop before the eighth round could be started.
Speaking after the fight to the BBC, Hearn said he thought Warrington was looking likely to win.
"I said to Tony Bellew that I thought Leigh was done," he said.
"He looked almost like he was sulking. I thought he was a round away from losing."
"Josh switched off for a second and it was goodnight Vienna.
"Josh was desperate to carry on and he was trying to compose himself. He didn't have his senses to carry on. The ref made the right decision, what a thriller."