Tyson Fury landed a whopping £12,000 after backing Joe Joyce to win in the third round.
The heavyweight contender knocked out Alexander Ustinov on the undercard of Billy Joe Saunders' world title victory on Saturday.
And Fury was ringside to see his bet come in before he heads out to America to complete his preparations for his fight against Tom Schwarz.
Joyce was a best-priced 11/1 to stop Ustinov in the third round according to Oddschecker with Fury having a £1,000 wager.
The 2016 Olympic silver medalist had considered pulling out of the fight in the build-up after falling ill.
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But he showed no signs of being under the weather as he won his ninth fight since turning professional.
"I would like a world title by the end of the year and to set myself up for some really big fights in 2020," Joyce said.
"It's a 50-50 fight between me and [Anthony] Joshua and it’s going to happen sooner or later.
"I've taken a lot of confidence from our spars. We’re talking in the hundreds of rounds that we did on GB, maybe more.
"I've learned more since then and I’m sure he has as well so it would be a great fight at some stage.
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"I've probably done more rounds with him than anyone in the world other than Frazer Clarke. It would be hard for him to come up with any surprises, I know his strengths and weaknesses.
"I know what I’d have to do – I know how to beat him.
"It’s something I’ve thought about a lot. I think it’s always there in the back of my mind.
"It was always quite competitive between us on the GB set up. He qualified first and got on the squad first so I felt like I was always playing catch up with him then and I am now again we are pros."
