The Scarlet Witch owns Magneto just like in X-Men Evolution when she got pissed. Atlas nowadays is probly in the Top 5 or 10 strongest beings in Marvel, so he takes out Colossus easily once he gets big enough. Vision beats Cable cuz Cable's primary power, his telepathy, wont work against Vision since he's an Android. Wonder Man owns Carnage, that's not even a contest. Stryfe telepathic powers are way too much for Sandman, so Stryfe owns him. Omega Red and Iron Man would stalemate. Mantis owns Wolverine easily since Mantis is a high-level cosmic being, 'NUFF SAID there. Sabretooth owns US Agent, Sabretooth's claws would probly rip threw Agent's shield after a while since Agent's shield is only made of steel or titanium or whatever, which is not unbreakable like Cap's. Bishop and Demolition Man stalemate for a while but eventually Bishop wins. His future weapons would eventually be too much for DM.
Scarlet Witch
Atlas
Vision
Wonder Man
Iron Man
Mantis
VS
Stryfe
Omega Red
Sabretooth
Bishop
What would happen then is the Scarlet Witch and Stryfe would probly stalemate for awhile. So then Wonder Man and Iron Man would take out Omega Red while Atlas takes out Bishop but Sabretooth takes out Vision. But then Atlas would take out Sabretooth while Wonder Man and Iron Man help the Scarlet Witch to take out Stryfe. Avengers win.