Jay Glazer: Only One Way Brock Lesnar Wins ...

Jay Glazer ain't just the ultimate NFL insider, he's also an MMA aficionado -- and he tells TMZ Sports there's only ONE WAY Brock Lesnar beats Mark Hunt at UFC 200.

By the way, Glazer was hangin' out with NFL superstar Jadeveon Clowney in Bev Hills Tuesday -- turns out, he's doing some MMA training with the Houston Texan at his Unbreakable Performance gym in L.A.

"He's working his butt off out here."

As for Brock, we'll see if he takes Jay's advice when he steps into the Octagon on July 9th.