How did Saitama defeat a monster before becoming a hero?


Reading the One Punch Man wikia I've read that when a younger Saitama, before
being a hero, was able to defeat a monster. How was this possible? Did Saitama
have some power before becoming a hero?




Saitama was nowhere near as strong before. He did defeat a monster and that is
what motivated him to become a hero and that is where his training started.
This is clear in the anime and manga. However, it does not necessarily say
whether Saitama had fighting skills or if the monster was weak. You cannot
determine whether Saitama at that point was stronger than what a normal human
was but as shown by his fighting skills when fighting the monster in the anime
you may assume he is stronger than the average human. Therefore he could be
considered somewhat strong but in comparison to his current figure and other
heroes such as Genos he was quite weak before he was a hero.

