Robert Guerrero has announced his retirement.
The former world champion took to social media to make the announcement after a professional career that has spanned 16 years and countless world championship reigns.
Guerrero started his career unbeaten in his first 17 fights, winning his first title, the NABF featherweight title, in 2004 in just his 15th fight. Guerrero lost the title a year later but bounced back nine months later, winning the IBF featherweight from Eric Aiken after Aiken's corner retired after the eighth round.
After his first pro loss, Guerrero went undefeated for nearly eight years, defeating the likes of Andre Berto, Joel Casamayor and Selçuk Aydın. This set up the biggest fight of Guerrero's career: Floyd Mayweather Jr. Guerrero, the WBC interim welterweight champion, challenged Mayweather, the WBC and lineal welterweight champion on Cinco De Mayo 2013 weekend.
Guerrero lost that fight via unanimous decision and his career never recovered. He lost three of his next five fights, losing to Keith Thurman and Danny Garcia for the WBA and WBC welterweight titles, respectively, in that span.
His last fight was just this weekend when he got stopped in the third round against Omar Figueroa in a PBC on FOX card from Nassau Coliseum in Long Island, New York. Guerrero was knocked down five times in that fight.
The 34-year-old, nicknamed "The Ghost," retires with a 33-6-1 (2 NC) record and having held the IBF featherweight, IBF junior lightweight, WBA and WBO interim lightweight and WBC interim welterweight titles.