This is a really tricky question, and depends heavily on what you mean by "beat" and "straight up fight." I'm going to assume by "beaten" we mean "temporarily disabled or demoralize to the point where conflict ends," and not "kill forever, with no possibility of reprisal." And by "straight up fight," I'm going to assume we mean a street fight in which both heroes enter the battlefield from the one end of one city block, and battle each other on the actual street. Thus cars, pedestrians, streetlamps, etc. are all possibilities. Given those understandings, I'd give the following characters the following odds of defeating Cap in a fight:
Character |
Odds |
Notes |
Iron Fist |
1:1 |
Outmatches Captain America in HTH fighting skills. Shield nullifies "Iron Fist" power. |
Shang Chi |
2:1 |
Outmatches Captain America in HTH fighting skills. Lacks superhuman endurance and strength. |
Daredevil |
2:1 |
Effectively matched in HTH skill, DD's superhuman senses aren't a match for Cap's superhuman strength and endurance. |
Wolverine |
4:1 |
Outmatched in fighting skill and strength. Wolverine is a berserker, exactly the sort of foe Cap excels against. |
Spider-Man |
5:1 |
Outmatched in fighting skill, easily demoralized. Experience will win out here. |
Deadpool |
8:1 |
Basically Wolverine without the willpower to stay in the fight. Will fold like a cheap suit. |
Luke Cage |
8:1 |
Vulnerable to pressure point attacks, poor HTH skills (overrelies on raw power). |
Punisher |
10:1 |
Hopelessly outclassed. |
So I give Iron Fist the best chance at taking down Captain America, but really these are all heavily weighted towards Cap because whie Cap might be "street level" himself, he's used to punching way, way above his weight class and dealing with foes that are
far more powerful than he is. Matched against other street fighters, Cap's superior tactics, mastery of all combat styles, vast experience, and peak-human capabilities are going to wipe the floor with a lot of these guys.
And yes, yes, I know, Cap can't ultimately defeat Wolverine or Deadpool due to their healing factors, but again, this isn't a battle to the death, it's a street fight, and while neither of them can die, they're both more than capable of having their bell rung hard enough for Cap to claim victory.