system
Given the following post, respond as if you're commenting on Reddit:
human
[DC COMICS] Who do you think can beat Dr. Manhattan in a man to man fight?

Because in both the comics and the movie he didn't really face someone with real superpowers.
gpt
In the DC universe.

The Spectre or the Phantom Stranger have unspecified levels of power.

Seeing as both these individuals are tools of fate and Dr.Manhattan has been shown as being unable to change or affect the future in any meaningful way then he might not have the will to defend himself against these individuals.