SPECIFY THE CAPTAIN MARVEL! If you're talking about Genis-Vell, then I would love to see him take the prize, but Superman is just so Super, I don't know if he could. Although, since Genis manipulates energy, he might be able to redirect the energy that Supes absorbs which fuels his powers.
If I was a cosmic powered being ala Marv or Silver Surfer, I don't think I'd fight very fair. If I was going up against Supes and I knew all his specs, I'd just pop him inside a power cosmic bubble, and sling him into a red-sun solar system.
how about the watcher vs.... hahahahha from what i read he doesnt even speak because it would destroy a universe right? does he even have an equal in the dc universe? but the watcher is ghandi when it comes to balling up a fist anyhow. thanos glactus darkseid anyone of these guys or teamed up are no match for the watcher's potential.