@corysandhagenmma, Instagram Cory Sandhagen has an answer for all the critics counting him out before he even steps into the cage with Merab Dvalishvili . On Tuesday, it was officially announced that Sandhagen (18-5) is booked to challenge Dvalishvili (20-4) for the undisputed bantamweight title in the co-main event of UFC 320 on Oct. 4 in Las Vegas.