I've been wondering this for a while, considering I've read all of Hajime no Ippo. We all know Batman is a monster at close range combat, but how well would he fair against a trained, peak (or slightly above) human boxer in his element?
Standard rules of boxing applied
Batman gets no physically enhancing equipment.
Both sides get 4 month prep time.
Both sides are in top mental condition.
Both are in physical prime.
And we all know batman is more popular, and he would win in a fight in his domain... or really any other situation. But this is about this one.