Known as "The Flea", Richardson turned pro in 1982. Richardson's professional career peaked in February 1991, when he scored an upset victory over Raúl Pérez and won the WBC bantamweight title. Trained by Earl Charity, Richardson's quick reflexes were credited with earning him a 12-round unanimous decision over Perez, who held the title for almost 28 months. He defended the title only once before losing the belt to Joichiro Tatsuyoshi in 1991. In 1992 he moved down in weight to take on WBC super flyweight title holder Sung-Kil Moon, but lost a majority decision. He retired in 1996.
During his career Greg Richardson also held the NABF Bantamweight Title, as well as the USBA Bantamweight and Super Bantamweight Titles.
| WBC Bantamweight Champion
25 Feb 1991 – 19 Sep 1991
- "Greg Richardson". Boxrec Boxing Encyclopedia. Retrieved 2007-11-30.
- Nadel, John (February 26, 1991). "Richardson WBC Champion". The Associated Press.
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