Conor McGregor 's switch to boxing in 2017 to take on Floyd Mayweather was a lucrative one, with the fight said to be the second-highest selling pay-per-view event in the history of the sport.
The bout was dubbed 'The Money Fight' and the World Boxing Council even created a Money Belt for the event.
Mayweather defeated McGregor by TKO in the tenth round and, according to 888 Sport, the UFC superstar became the second 'richest loser' in the process.
888 Sport have looked back at the biggest fights in boxing history, how much the losers were guaranteed and then adjusted their earnings for inflation to work out who would have banked the most in today's money.
McGregor took home a minimum purse of £21.8m for his loss to Mayweather, which would be worth over £23m today.
That amount puts him second in the 'richest losers' list behind Oscar De La Hoya, whose guaranteed purse for his controversial majority decision loss to Felix Trinidad would be worth almost £24.5m in today's money.
Former two-weight world champion Michael Spinks earned the biggest payday of his career when he faced Mike Tyson in a bout that was the richest in boxing history at the time.
The then undefeated Spinks was knocked out by Tyson in just 91 seconds as he banked a guaranteed purse of £9.8m, which would be worth over £22m today.
In fourth place on the list is Manny Pacquiao, whose fourth meeting with Juan Manuel Marquez was billed as the 'Fight of the Decade'.
The event exceeded one million buys on pay-per-view and saw Pacquiao earn a guaranteed £22m (18.9m at the time) as he was knocked out by Marquez in the sixth round.
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De La Hoya also rounds out the top five for his 2007 defeat to Mayweather, which saw him lose the WBC middleweight title.
Maayweather ultimately won the bout by split decision, with De La Hoya earning £21.8m (£16.9m at the time) in defeat.
Top 5 richest losers in boxing
1. Oscar De La Hoya vs Felix Trinidad – £24,499,514
2. Conor McGregor vs Floyd Mayweather – £23,786,659
3. Michael Spinks vs Mike Tyson – £22,162,808
4. Manny Pacquiao vs Juan Manuel Marquez – £22,003,850
5. Oscar De La Hoya vs Floyd Mayweather – £21,835,066
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