Here's an interesting one: Gandalf vs. Gothmog (and I mean the Balrog, not the weak little tumorous Orc general.
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depends if gandalf use's his true power if he doesn't gothmog will probably win and i agree with huan and beorn but i imagine it will be an extremely brutal battle.
heres some more
the ents vs the mumakil
celegorm and curufin vs elladan and elrohir
ungoliant vs orome