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Greg Hardy is a changed man -- and has earned a 2nd chance to have a career as a pro athlete ... so says Dana White.

Of course, there have been plenty of critics who don't believe Hardy -- who was previously arrested for domestic violence -- deserves a chance to fight in Dana White's Contender series, including Jay Glazer.

For the record, Hardy was initially convicted -- but appealed the decision, and the verdict was later overturned after the alleged victim stopped cooperating with authorities.

White says Hardy has made mistakes in life -- including issues with drugs and alcohol -- but says he's confident Hardy has sobered up and turned his life around.

The former NFL star has racked up 3 impressive victories in his first 3 MMA fights -- and White believes the guy has real potential.

Hardy will be fighting Austen Lane on June 12 -- and if he wins, it's possible White could award him with a UFC contract.