Originally posted by Stigma
^ Rather a tie, I'd say.
Nah. Thanos would still have a chance to return to his body. The Ancient one would be dead. I'd say Thanos has the edge there.
In any case, I don't see the Ancient one being able to approach near enough for a palm strike without getting cut in half.
Edit: Just realized OP says this is Thanos from the battle of titan, which means he already has 4 stones. He definitely wins this fight.