TMZ Sports has learned Arian Peterson has officially signed a contract to fight his poker adversary in a boxing ring.

"Baby Joe" Castaneda is already training to fight Adrian Peterson -- and we have the video!

Adrian Peterson's begun training for his celebrity boxing match with his poker rival ... and while his hands could certainly use some more sharpening, it's clear he's in great shape. Check out some ...

Former NFL MVP Adrian Peterson is lacing up the gloves once again, this time for a celebrity boxing match against professional poker player Joe Castaneda. The matchup stems from a physical altercation ...

Adrian Peterson is one of the most decorated athletes in the history of football. However, he never boxed. Thus, the 15-year NFL veteran is training seriously for his upcoming boxing match with fellow ...

Legendary former Minnesota Vikings running back Adrian Peterson has begun preparations for his upcoming Celebrity Boxing match against the man he came to blows with during a game of poker back in May.

Former Minnesota Vikings star running back Adrian Peterson is still more than $10 million in debt stemming from a loan he didn’t pay back after the Vikings declined to exercise an $18 million option ...