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'Baby Joe' Castaneda Signs Celebrity Boxing Contract to Fight Adrian Peterson

Round II between Adrian Peterson and his poker rival looks like it will, in fact, go down inside a ring ... as TMZ Sports has learned the NFL legend's adversary has signed a contract with Celebrity Boxing.

The promotion's founder, Damon Feldman, tells us ... Joe "Baby Joe" Castaneda agreed to a scrap with Peterson this week -- and formally put pen to a pact on Tuesday.

Adrian Peterson tmz sports 2
Adrian Peterson tmz sports 2

Peterson's yet to ink his deal .