Who is the weakest Character that Could Beat Cyborg Superman?

Who is the weakest can defeat him bloodlusted or in character, no prep, and standard gear. It does not have to be current version. By Ko or incapacitation.

Cyborg Superman has his Sinestro Corps Rings.

Battle Takes place where ever you think it gives his opponent an advantage.

Physically weakest? Or...weakest, like, in terms of effects they can produce?

Pip

Bugs Bunny

Blink if Exiles. 

BATMAN!!

@greenteaforme: I meant in terms of the effects they could produce