How's this for confidence ... Keith Thurman is so certain he's gonna knock out Manny Pacquiao in the 1st or 2nd round, he's putting $10,000 up so he can cash that extra check!!!
Keith and Manny are squaring off at the MGM Grand on July 20 -- in a fight Thurman thinks he'll EASILY win.
"I'm younger. I'm gonna let my hands go in a way that Adrian Broner didn't," Thurman tells TMZ Sports ... "I'm gonna make it a fight!"
Remember, Broner LOST via unanimous decision when he fought Pacman back in January -- Keith says Broner simply didn't come with any offense that night.