LeBron James and the Cleveland Cavaliers are gargantuan underdogs heading into the NBA Finals

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LeBron James and the Cleveland Cavaliers are 650 underdogs to upset the Golden State Warriors in the NBA Finals according to Las Vegas bookmakers.

It's the biggest underdog James has ever been in his nine career trips to the NBA Finals.

Game 1 is Thursday, with the Golden State Warriors opening as 12-point favorites over the Cavaliers.

The NBA Finals are officially set, and Las Vegas has the Golden State Warriors heavily favored over the Cleveland Cavaliers to win the seven-game series and take home the NBA Championship for the third time in four years.

The Westgate SuperBook in Las Vegas set the Warriors as -1000 favorites to win the series, meaning bettors would have to put down 1,000 on Golden State to win 100 on their bet. For those that have faith in LeBron James and the underdog Cavaliers, their odds are set at 650, meaning a 100 bet would earn a 650 return should they pull off the upset.See the rest of the story at Business InsiderNOW WATCH: NBA ref explains the difference between flopping and selling a callSee Also:LeBron James takes immaculate care of his body, and the NBA world is in awe of itLeBron James just pulled off what his former GM called 'unprecedented' and perhaps the most impressive accomplishment of his careerLeBron once again showcased his photographic memory, recalling all 6 of his turnovers in exact detailSEE ALSO: FiveThirtyEight shows the Rockets' historic shooting collapse was a 1-in-72,000 anomaly

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