"If you want to get some legitimacy in the game, fight somebody with a name!"
That's former boxing superstar Antonio Tarver -- who famously defeated Roy Jones Jr.TWICE -- calling out Jake Paul for a sanctioned fight!
"I want to fight him, because I want to show him there are levels to this," Tarver tells TMZ Sports.
FYI, Tarver is 52 years old and hasn't fought in 5 years. Jake is 23 and coming off a highlight-reel knockout of Nate Robinson.