Oddsmakers Compare Donald Trump's Presidential Bid to Leicester City's Soccer Victory

— -- British bookmaker William Hill is now giving Donald Trump a 33 percent chance of winning the U.S. presidential election in November, comparing the presumptive nominee to the Leicester City soccer team.

Trump's victory in Tuesday's Indiana primary has boosted his chances of winning the general election, the betting site said, comparing Trump's rise to that of the underdog soccer team that clinched a victory in the Premier League on Tuesday after a fairy tale rise from the bottom of the league.

Trump has also come a long way in terms of betting odds: He was first offered to bettors with "no-hope odds" of 200-to-1 to make it to the White House, according to the bookmaker. After last night's primary, his odds are 2-to-1, or 33 percent.

"We've just paid out on the longest odds ever seen in U.K. sport of 5,000-to-1 on soccer club Leicester City winning the Premier League," betting website William Hill's spokesman Graham Sharpe said in a statement. In other words, bettors risked $1 to win $5,000 off the wager. "Now, Donald Trump is set to become our longest ever political odds winner."

Democratic hopeful Hillary Clinton is still the favorite to win in November, with a 73 percent chance, or 4-to-11, following her loss in Indiana to rival Bernie Sanders.

While betting on political contests is illegal in the U.S., it's permitted in the U.K. One of Trump's biggest bettors is a British investor who placed about $10,400 in bets and hopes to win $112,000 from William Hill. John Mappin, owner of the Camelot Castle Hotel in Cornwall, England, began betting on Trump in July when the candidate was 20-to-1 to become the Republican candidate.

Sharpe said he and many others underestimated Trump's appeal and commitment and could pay the price.

"Donald Trump was seen originally in being a useful figure to make people aware of the impending election before the serious contenders moved him aside and decided who would be Hillary's authentic challenger," Sharpe told ABC News.

According to Irish bookmaker Paddy Power, both Trump and Clinton’s odds have improved in the past month as they both increased their lead over their competition.

On the other hand, Sanders was 20-to-1 last month, and went to 40-to-1 after New York’s primary results on April 19, according to Paddy Power. But now the Democratic ticket hopeful has settled into 33-to-1 following his surprise win on Tuesday.

Ohio Gov. John Kasich was 80-to-1 last month to win the election in November, but now he's a very unlikely 125-to-1 shot, Paddy Power said.