First select any wrestler except The Miz to play as then select Miz as your opponent but deselect Miz before you confirm his attire. Then change your wrestler to The Miz and at this point your opponent will change to Mr. Fuji. Now select Mr. Fuji again and then deselect The Miz, now switch which slot your playing as from the left to right and you should be able to pick from the list of managers.