Irish raider Mr Boss Man was one of six winning favourites at Wolverhampton in the 32RedSport.com Handicap as one punter picked up over £245,000 for a total outlay of just £30.
The online William Hill customer, a 34-year-old from the Southampton area, backed every winner on the seven-race card, with his bet consisting of a £10 each-way seven-fold and a further £10 win seven-fold.
He placed his bets at 10pm on Tuesday night, taking a number of early prices.
Trained by Ado McGuinness, the eight-year-old Mr Boss Man was having his second trip to Britain in the space of a week after winning over a mile and three-quarters previously.
Stepped up to two miles and with a 6lb penalty he just held on from Pass The Time under Pat Cosgrave as the 7-4 favourite.
“The two miles might just stretch him a bit on the Flat,” said McGuinness.
“I think it was more to do with the fact that Pat got shuffled a bit further back than he ideally wanted.
“That meant going out on the second circuit he had to set him alight a bit to pass a few.
“Probably a mile and three-quarters is his perfect trip, though.