Gamblers irate over the NBA betting scandal could have a slam-dunk lawsuit that could cost the league billions in litigation and reputational damage, gaming-law experts contend.

“The risk to the league to defend this and all of the dominoes off of it, including the overall integrity of the brand is definitely nine figures, and could be 10 figures,” International Masters of Gaming Law President Marc Dunbar told The Post.

“I wouldn’t be surprised if a lawsuit is dropped by or before next Friday.” 4

The Justice Department charged 31 defendants — including Portland Trail Blazers Coach Chauncey Billups, Miami Heat point guard Terry Rozier and ex-Cleveland Cavaliers player Damon Jones — in a major gambling bust Thursday that involved several major organized crime families.

“I can gu

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