Chuck Norris (who the internet says weighs170 lb) or any other welterweight fighter ever?
Chuck Norris FACTS:
Style: Chun Kuk Do, Tang Soo Do, Taekwondo, Brazilian Jiu-Jitsu, Judo
Rank: 10th degree black belt Chun Kuk Do
9th degree black belt Tang Soo Do
8th degree black belt Taekwondo
5th degree black belt in Karate
black belt Brazilian Jiu-Jitsu
black belt Judo
http://espn.go.com/mma/rankings/_/class/welterweight
(I can't find who is considered the best welterweight ever, so throw in some better names if you know them).
Modern day UFC rules would apply.