Guzman turned professional in 1985 and captured the WBA flyweight title in 1992 with an upset decision win over Yong-Kang Kim. He lost the belt in his first defense to David Griman by decision (scoring of judges) in 1994. He later challenged Saen Sor Ploenchit, Alimi Goitia, and Yokthai Sithoar for their respective belts but lost each fight.
Guzman is the only world champion to ever have finished his career with a losing record, retiring in 2001 with a record of 13-14-3 with 8 KO.
|WBA Flyweight Champion
1992 Sep 26 – 1992 Dec 15
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