Getty Sean O'Malley, Petr Yan MMA superstar Sean O’Malley is claiming that UFC bantamweight champion Petr Yan turned down a rematch against him. O’Malley, who is one of the UFC’s biggest stars , returns to the Octagon in June when he battles Aiemann Zahabi on the South Lawn at the White House at the historic UFC Freedom 250 event. However, the former champ O’Malley is claiming that he was originally set to fight Yan in a rematch, but the current champ turned him down. Sean O’Malley Claims Petr