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What does Prince Fielder do now that his baseball playing days are over? Give lap dances, of course!!

The former home run machine competed in a lap dance contest at the Absinthe Show in Las Vegas Thursday night ... and it's clear Fielder hasn't lost that competitive drive, cause the dude GOES ALL IN.

Check out the vid ... Fielder goes a bit overboard, forcing the judge to cut his dance after only 14 seconds. But that doesn't stop him from coming out on top ... winning, you guessed it ... FREE SHOTS!!

Keep swinging for the fences, Prince.