Mark Cuban -- Picked for Jury in Fender Bender Lawsuit

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Dallas Mavericks owner Mark Cuban won't be spending Monday afternoon blogging or ripping NBA officials ... instead he'll be deciding someone's legal fate on a jury.

Cuban showed up to Dallas County Civil Court today and flaunted his jury summons on Instagram. As luck would have it -- bad luck -- Cubes got picked for a case!

According to court records ... the "Shark Tank" star and 11 other citizens are hearing a case involving a two-car accident from 2012 -- one driver is suing another for negligence. The trial is expected to wrap up today.

As long as neither party cops to being a Spurs fan, Cuban should be able to remain impartial. And you just know one of his fellow jurors is gonna pitch him a business idea.