Genos VS Mosquito Girl Soundtrack So I was rewatching One Punch Man, and when Genos started fighting Mosquito Girl, I was really enjoying the music. Is it on the OST, or is anyone able to tell me where it is from?
Yes.
The name of the song is "The Cyborg Fights" or it can be found under the name of   "Genos Fight Theme"

Here are some links where you can listen the song:

https://www.youtube.com/watch?v=2D6g0__M3sk

https://www.youtube.com/watch?v=DdhF0XlqJrg

It is present in the official soundtrack of the anime.