I have my reservations about how Beterbiev might cope if / when he comes across a guy who can push him on to the back foot, but Maske ain't the guy to do that. Assuming the referee was impartial and Maske wasn't allowed to get away with all his spoiling and fouling whenever his opponent got close to him (he was a fu*ker for pulling their head down with his forearm in clinches and holding their arm on the referee's blind side), I'd go with Beterbiev. Maske might take him the distance but I don't think he's busy enough, or hits with enough power, to win this. Beterbiev by UD by virtue of his aggression, ability to maintain his pace in the late rounds and his consistent forward momentum, which Maske's doesn't have the style or willingness to halt.