I don't know a whole lot about superheroes, but here's what I think:
Captain America doesn't stand a chance against Superman. The Man of Steel has a plethora of superpowers to choose from, while the First Avenger has strength and patriotism. Your patriotism can't save you this time, Cap.
My knowledge of Cyborg is admittedly limited, but I'm going with the fact that Tony has a wide variety of suits while Cyborg has a set group of powers. Iron Man would likely be able to develop a suit specifically able to counter Cyborg.
Don't know enough about Thor or Wonder Woman, so going to skip this one.
Definitely Deadpool. I don't know if Deathstroke also has a healing factor, but I know that Deadpool is all but invincible, so my vote goes to him.
Like the first one, no contest. The Joker has no superpowers, and Magneto has no easily exploitable weaknesses. It would be over rather quickly.
Goin' with Thanos because of the Infinity Gauntlet. I just figure with all of the Infinity Stones being controlled by one person, that person is going to be nearly unstoppable.
I actually think the Green Lantern would win this fight. I'm just remembering Strange's reluctance to kill or even harm enemies, which I think could cost him the fight. Then again, he's definitely clever enough to work something else out, so I could see this going either way.
Yeah, not going to vote on this last one. Both universes hold vast rosters of characters, and the fight could go any which way depending on the specifics of the battle. Just too open a question for a simple y/n answer.