who are the mma champions?
['UFC: Stipe Miocic. Bellator: Ryan Bader. ... ', 'UFC: Jon Jones. Bellator: Ryan Bader. ... ', 'UFC: Israel Adesanya. Bellator: Vacant. ... ', 'UFC: Kamaru Usman. Bellator: Douglas Lima. ... ', 'UFC: Khabib Nurmagomedov. Bellator: Patricio Freire. ... ', 'UFC: Alexander Volkanovski. Bellator: Patricio Freire. ... ', 'UFC: Petr Yan. Bellator: Vacant. ... ', 'UFC: Deiveson Figueiredo.']