Sonic can just get to use his temp freeze attack that would render Zero UNABLE to do anything for a short period ! And what about when he is in Gold Sonic ? He would be faster stronger and invulnerable for a short period.

I just need to know how the hell Zero could beat that.

Anyway if Sonic do circle arround Zero at his top speed Zero wouldnt be able to keep up whit Sonic, mainly because his poor metalic carcass cannot keep up whit Sonic speed no matter how much he compute his reaction time cannot even come close to the one of Sonic.