Liverpool’s 2005 Champion’s League final comeback from 3-0 down against AC Milan took second spot in the study of 2,000 adults, followed by unfancied Greece winning the Euro 2004 trophy.
England’s loss at the hands of Iceland at Euro 2016 came fourth.
Completing the top five was the moment Boris Becker upset the reigning tennis champions by winning Wimbledon in 1985, at just 17 years of age.
Nearly one in five (23 per cent) believe Japan beating South Africa at the 2015 Rugby World Cup was the biggest upset they’ve witnessed.
And 15 per cent picked 10-1 underdog Leon Spinks getting the best of arguably the best boxer of all time, Muhammad Ali, in 1978.
The research was commissioned by Lottoland.co.uk, which has launched its UK Sportsbook during the 2020/21 Euros so that fans can place their bets on the competition.
A spokesperson at Lottoland said: “Unexpected winners rising to the top are what keeps sport exciting – especially if you happen to be supporting the underdogs.
“Everyone wishes they’d had the foresight to put a bet on Leicester, who were famously 5000-1 to win the Premier League the year they rose to the top.
“But we’re looking forward to seeing who people are putting their money on at the Euros this year, have Brits been standing by the home nations or is it too tempting to stay safe and bet on the favourites?”
Other major sporting upsets revealed in the poll include The Boston Red Sox beating the Yankees in the Baseball World Series in 2004, and England beating Australia in the third test of the 1981 Ashes.
Just under half of adults polled enjoy a sporting underdog winning when nobody gave them a chance beforehand.
And 47 per cent think it makes it even more special if the lesser-fancied team or athlete had to go through serious adversity on their way to glory.
If they don’t support either side of a sporting match-up, 56 per cent will naturally support whoever the underdog is, by default.
But six in 10 of those polled are more likely to play it safe and bet on the most expected outcome of a sporting matchup.
Seven in 10, however, bet against the team they support – so even if their side loses, they win personally.
Although 28 per cent would never put money on their team’s deadliest rival winning a game, even if the result was guaranteed.
The study, commissioned via OnePoll, also found 55 per cent of unoptimistic respondents believe England winning this summer’s Euros would constitute a sporting upset.
Lottoland’s spokesperson added: “England winning the Euros is just as likely as Greece winning it back in 2004.
“Because it’s been such a long time since a British football team have won anything internationally, it does feel a bit like it will never happen. But with the support of the nation, anything is possible!”
Fans can place their bets on the Euros with Lottoland at Lottoland.co.uk.
THE TOP 25 SPORTING UPSETS OF ALL TIME:
1. Leicester winning the league in 2016
2. Liverpool coming back from 3-0 down to beat AC Milan in the Champions League final, 2005
3. When Greece won Euro 2004
4. England losing to Iceland in the 2016 Euros
5. When 17 year old Boris Becker won Wimbledon in 1985
6. When Japan beat South Africa at the 2015 Rugby World Cup
7. Aston Villa beating reigning champions Liverpool 7-2 in the Premier League, 2020
8. England beating Australia in the third test of the 1981 Ashes
9. Wigan winning the FA Cup in the 2013 final against Liverpool
10. The moment when James “Buster” Douglas knocked out Mike Tyson in 1990
11. The US ‘soccer’ team beating England 1-0 in 1950
12. Leon Spinks beating Muhammad Ali in 1978
13. Andy Ruiz knocking out Anthony Joshua at Madison Square Garden in 2019
14. Goalkeeper Allison Becker scoring for Liverpool in 2021
15. Liverpool falling 25 points behind Manchester City in 2020
16. When Federer was beaten by Juan Martin del Potro in 2009
17. When Chelsea beat Bayern Munich in the Champions League Final in 2012
18. When the US hockey team beat the Soviets in 1980 in ‘The Miracle on Ice’
19. When James Cahill beat Ronnie O’Sullivan, 2019
20. Journeyman Robin Soderling knocking out Rafa Nadal at Roland Garros in 2009
21. Kei Nishikori knocking out Andy Murray at the US Open, 2016
22. None of the above
23. The Boston Red Sox beating the Yankees in the Baseball World Series in 2004
24. When Jeff Kidder was the biggest-priced Cheltenham winner in 31 years
25. Trevor Immelman winning the 2008 golf Masters
Liverpool’s 2005 Champion’s League final comeback from 3-0 down against AC Milan took second spot in the study of 2,000 adults, followed by unfancied Greece winning the Euro 2004 trophy.*Copy, *Images, Sport
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