User blog comment:JoePlay/The Avengers Battle Royale - The Smack Down/@comment-5038872-20120421092739/@comment-3217795-20120422123139

While Bahamut may know best, he apparently doesn't know Winter Soldier. Hes an assassin trained to kill superhumans. He defeated Wolverine by luring him into a warehouse that he'd seeded with pepper spray canisters. If WS has even minimal planning time, he has a chance. Two words:  Adamantium bullets. WS has not only has access to them, they are in his usual arsenal. Though I will admit, if this is just a straight up fight, WS's head would get popped like an oversized pimple.

That said, if this is ALL straight up fights, Firestar has one trick in her arsenal that Black Widow can't defend against. Omni-directional microwave burst. Causes her general vicinity to hit 800 degrees F within a microsecond.

So you have your choice. Is it all straight up fights? If thats the case, Cage would win easily, since Winter Soldier can't use his assassin tricks in a close up fight. In that case, also, Black Widow loses fairly quickly since shes also a stealth and tactics person. The only REAL chance she has against a ranged superhuman combatant like Firestar is if she catches them by surprise. No surprise, no chance.