Tommy Fury missed out on a bonus totalling nearly £4 million from his grudge match against Jake Paul earlier this year.
Don't go getting your tiny violins out just yet, as the 23-year-old boxer still earned a bucket-load of cash for the fight, he just missed out on a big prize.
As Fury prepares to take on KSI at Manchester's AO Arena tomorrow night, we look back in his previous fight and wonder whether he might be able to take him an even bigger prize this time out.
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Fury beat his long-time rival Paul on 26 February, but reportedly didn't sign a contract that would have earned him double his £2,000,000 purse.
The pair finally settled their differences when they stepped into the ring at the Diriyah Arena in Saudi Arabia following a two-and-a-half-year long feud.
Although Paul talked the talk, ultimately the judges decided after their eight-round fight that Fury was the victor.
It wasn't surprising for the fans, although it was in the sense that the 26-year-old influencer was the more visibly confident of the two.
In fact, Paul was so sure he was going to win, he proposed a huge bet just a few days before their bout.
Speaking at their press conference, the YouTuber-turned-boxer attempted to call Fury's bluff, offering to give his purse a huge boost.
"I think we make a deal - if you win, I'll pay you double what I'm paying you already," Paul explained.
"But if I win, I take everything that I'm paying you. Deal or no deal, seeing as you're so confident?"
Although Fury appeared apprehensive at first, they shook hands after his dad Big John Fury stepped in to agree to the wager.
In a face-to-face interview aired on 24 February, Paul handed the contract to his adversary, who said he'd take it to his legal representatives and promised to sign it.
But just before the anticipated showdown took place, the 'Problem Child' claimed Fury's side had gone 'silent as a mouse', alleging that the contract was yet to be signed.
After the the fight was over and done with, it appears the 'double or nothing' deal didn't go through, meaning Fury missed out on a massive bonus.
According to Sports Zion, the younger brother of Tyson Fury earned a $2 million (£1.6 million) purse, as well as 35% of the pay-per-view share, plus a $1 million (£825k) performance bonus for winning.
This means that he took home a total of approximately £4 million.
But had he signed the dotted line, Paul would've had to pay him double - in other words, that's £4 million down the drain.
All that being said, Fury still got a massive paycheque - and no doubt the glory he's enjoying from beating his longtime rival was priceless.
Tomorrow night, he'll be hoping that there'll be more eyes on the fight, and more people paying for pay-per-view.
Along the way, he'll be hoping he can silence another YouTuber-turned-boxer who has been talking big in the build-up,
We'll find out whether KSI can back up his boasting tomorrow night.
Tom Wood