TUCSON, AZ (August 24, 2017) — Undefeated World Boxing Organization (WBO) world champions ÓSCAR VALDEZ and GILBERTO “Zurdo” RAMIREZ will headline and exciting world championship event on Friday, September 22, at Tucson Arena (260 South Church Ave., Tucson, AZ 85701.) Valdez (22-0, 19 KOs), a two-time Mexican Olympian with strong