In September 1993, he lost his first title shot to World Boxing Board Light Welterweight champion David Kamau.
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On November 29, 1997 Valdez lost to three-time world champion, American Antonio Margarito in Orleans Hotel & Casino, Las Vegas, Nevada.
César Award | Cesar Department | Cesar Romero | Julio César Chávez | Exxon Valdez | César Pelli | César Franck | César | Cesar Chavez | Cesar Montano | Valdez, Alaska | Valdez | César Vallejo | César Gaviria | Cesar | Julio César García | César Aira | Fernando Valenzuela | Exxon Valdez oil spill | César de Missy | César Cui | Cesar Castellani | Augusto César Sandino | Ronaldo Valdez | Luis Valdez | Júlio César Soares Espíndola | Julio César Romero | Julio César Green | Juan Valdez | Jeff Valdez |