"Weak" character goes to a much lower stakes environment, becomes super powered by comparison

[u/Unable-Buyer4087]

Yamcha - Dragon Ball Super

In dragon ball, Yamcha has it pretty rough. He hasn't won a fight since OG dragon ball, and was outclassed almost as soon as he was introduced. By the buu saga, yamcha had all but given up on being one of the Z-fighters and tried playing baseball instead. But here's the thing: Yamcha still has basically superhuman strength, he just so happens to surround himself with people vastly stronger than him. He uses his martial arts skills and ki control to become a rich and famous baseball star.

Shocker - Spiderman / Ms Marvel

Shocker has become an absolute joke in Spider-Man and tired of being constantly beaten down by the many, MANY superheroes in Nyc, he decided to move to new jersey as it only has one superhero defending it. The inexperienced teenager, Ms Marvel. Due to the fact that shocker actually has quite a good power and literal decades of fighting experience, he actually puts up a very good fight and the only reason he doesn't win is because Ms Marvel is teleported away.

[u/notprogame]

Brian Scalabrine (aka white mamba) was one of the worst NBA players, averaging 3 scores per match.

After his retirement, he challenged 4 of his fans (who were at minimum D1 athletes) to a 1v1, beating them all with a total score of 44 to 6.

He even went on to say "I'm closer to LeBron than you are to me"

[u/Foolsgil → u/notprogame]

You know what, fair, but he didn't take them 4 on 1. Now that would have been chefs kiss.

[u/big_axolotl → u/Foolsgil]

He took on 3 regular dude co-workers and beat them easily

[u/Radiant_Grab_9400 → u/Foolsgil]

He did it in his 40s long after his retirement 

[u/Rikipedia → u/notprogame]

There's also the old Spike TV show "Pros vs Joes" whose entire premise is pitting regular dudes against pro athletes (mostly retired)