One punter made the "worst cash out decision in history" after taking a 45p return on a 5000-1 bet on Leicester City winning the Premier League.
The unnamed Ladbrokes customer staked 50p on the Foxes taking the title at the beginning of the season and stood to win £2,500 had he or she let the bet ride. But instead they decided to take a 45p return after just the first game of the season, which Claudio Ranieri's men won 4-2 against Sunderland.
Some punters, who backed the Foxes at similar odds have cashed out for thousands of pounds, with the highest payout being £72,000 settled on a £50 bet in March, according to Ladbrokes.
The Foxes are in the driving seat in the Premier League race and a win in their match at Manchester United on Sunday will secure them the title.
As a consolation, the bookmaker has asked the customer to come forward to offer them a pair of tickets to a game next season plus a free bet on any team to win the 2016-17 title.
Ladbrokes spokesman Alex Donohue said: "This will go down as the worst cash-out decision in history. Plenty of 5000-1 backers took sums midway through the season when it looked in the balance, but we wonder what our man didn't like about the 4-2 win on the opening day of the season."