Sinestro vs Magneto
vs.
Who is the top villain? Fight is on Earth. Both at full power.
Sinestro is under the impression that Magneto has killed Soranik Natu - who was helping control a mutant riot.
Magneto believes Sinestro has killed Xavier and Wanda and will continue to kill mutants if he does not step in.
Note: While I do not personally believe that Magneto can control the ring via his magnetism - some may be under the impression that he can. For this fight, he will not be able to even if he could [he can't].