Lenny Dykstra is fighting Bagel Boss guy ... yes, the baseball legend inked a deal to box the guy who lost his mind in a NY bagel shop.
We broke the story, Bagel Boss Guy -- aka Chris Morgan -- signed a deal to fight in Damon Feldman's Celebrity Boxing promotion ... only question was, who was he gonna fight?
Now we know ... 56 year old 3x-MLB All-Star and World Series champ Lenny Dykstra.
We're told Lenny agreed to a deal and signed the contract on Friday (he'll be paid a fixed amount of money for the fight) .