Are you asking if a person who gets paid to fight would prevail against a much bigger and arguably stronger untrained guy who most likely has never taken a real punch or been in a fight? Hmmm. Not even close.
And to those who say the boxer would have no chance if/when they went to the ground. 1) Would not happen and 2) If it did, BS. See below re: boxers and wrestling.
My disclaimer/humble brag: Back when I was stupid enough to fight just cuz, I was a small/skinny (but deceptively strong) kid who knew how to box and wrestle (most boxers can grapple) and took down just about every big, dumb oaf who thought he had an easy target.
Wonder how many posters here have actually been in a real fight? My guess? Very few, if any. And that's not a bad thing. My $ is on the pro flyweight every time tho.