And, yeah, Miz is dead serious about this -- claiming he's got the resume to back it up.
"I am the first-ever 2-time Grand Slam champion," Miz tells TMZ Sports ... "That means I've held [the WWE Championship] title twice. The Intercontinental more than twice. The United States champion twice and Tag Team Championships twice."
"I am the only one in the history of this business to be a 2-time Grand Slam champion. So in my opinion, I'm on the Mount Rushmore of WWE."