Megalo Box

In a boxing competition where every fighter is allowed to wear exoskeleton to support their abilities, a fighter defeats his first opponent without using any gear, warning the nickname "Gearless Joe". The fighter who calls himself "Junk Dog" takes part in said competition to make a living out of the price money.

I saw "Megalo Box" a long time ago so unfortunately I don't really have many memories from it, but the anime is good.

Now don't expect a masterpiece, it's an anime about boxing after all, but it's a typical From Rags to Riches story that follows an aspiring boxer on his journey to the big stage.