Machida

An eyebrow-less boxing champion who tricks Eikichi with a knuckle-duster and evasive maneuvers- he finally wins by smashing Eikichi with a street sign. While a reasonably good fighter, he only won because Eikichi wasn't expecting him to be trained- the next time they cross paths, Ryuji takes down the whole gang singlehanded while Eikichi beats Machida's teeth out, taking the boxer's punches and hitting him back harder.

(Source: Wikipedia)