Light-heavyweight world champ and No. 2 pound-for-pound fighter Vadim Nemkov takes on Olympic silver medalist Yoel Romero in the Bellator 297 main event from Wintrust Arena in Chicago. Plus, featherweight champ and No. 1 pound-for-pound star Patricio "Pitbull" moves down a weight class to challenge champion Sergio Pettis in a "Super Fight" for bantamweight gold.