A punter from London won £1,039,554 from an £11.50 six-fold accumulator, with the final selection winning after a dramatic golf play-off on Sunday.
Going into Sunday evening he had already won five of his selections, which included England to beat Czech Republic, Croatia to beat Scotland and three golf bets: Steve Stricker to win the Bridgestone Senior Players Championship, Nelly Korda to win the KPMG Womens PGA Championship and Viktor Hovland to win the BMW International Open
For his final selection, he backed Harris English at 35/1 to win the Travellers Championship - a winning tip for Dave Tindall in his Betfair column - and the monster six-fold was completed when Harris sunk a 20-foot birdie putt on the eighth hole of a play-off.
Speaking about the winning moment, the England football fan said: "I thought I was going to have a heart attack when the winning putt went in, I couldn't believe it."
"I've enjoyed watching the football, so I included a couple of Euros matches and I watch quite a lot of golf. I was sure that Hovland, Korda and Steve Stricker were good bets, but I was a little unsure on Harris English.
"When he won the play-off I was very relieved, I thought he had lost it after some wayward tee shots on the 18th hole."
Asked about what he plans to do with his winnings, he said: "I think I'm going to take a couple of months off work to take my partner travelling.
"I like playing golf too and I'd like to take some friends to the USA to play TPC Sawgrass.
"Hopefully, I'll be able to celebrate even more if England beat Germany. I think it will be a great game and I believe England will put the demons to bed and win 2-1."
Betfair's Sam Rosbottom said: "We're delighted for this London punter and couldn't be happier to pay out such a large amount of money."
"Since his big win, we've been in touch to help with his withdrawal and to deliver his big win education where we discuss the importance of controlling play, applying safer gambling tools, and coming to terms with a sum like £1 million.
"We share his optimism for the England match and hope the rest of the nation will be able to celebrate a win for Southgate's side."