Best fight scene where someone is physically outmatched but is able to win a fight without discovering some bs new power?

Perhaps anime is melting my brain, but I was wondering if there were any good examples of this in movies. It seems like most good fight scenes are where the opponents are almost evenly matched, and it's unknown who is actually more skilled. Also I'm not counting something like the Dr. Strange victory where the hero "wins" the fight by simply not losing. Looking for an actual physical fight.