User blog comment:Kuopiofi/Saitama - Absolute or Supernatural?/@comment-25893909-20160906164927/@comment-24053170-20160906182454

A few example of characters who could defeat saitama with no troubles-

1. Any user of air manipulation that can remove oxygen from the environment(saitama has been proven he needs air to survive, and without it he will die)

2. A user of absolute stamina, as saitama still requires rest and sleep, so while it may seem like his stamina is infinite it actually isn't.

3. any planetary parasite, as they take the planet with them when they die.

4. Any planet buster.

5. if the sun died, the resulting wave of heat and stellar mass would vaporize the planets atmosphere and boil all the water on the planet as well as leave the planet as a chunk of lifeless rock.

and these are just the small examples of things that could defeat saitama no matter how powerful he is. I could easily go on.

Saitama can only win a fight if he actually attacks his opponents with his fists, if he is unable to do so then there is no way for him to win no matter what his level of strength is or might be.