Watch the pro debut of phenom #XanderZayas Zayas returns on the undercard of the Oscar Valdez vs Robson Conceicao Friday Sept 10 on ESPN+ Next up for Top Rank Boxing, WBC super featherweight world champion Oscar Valdez authored a title-winning knockout for the ages in February over Miguel Berchelt. For his encore — and the first defense of his title — the undefeated two-time Mexican Olympian will make his desert homecoming. Valdez (29-0, 23 KOs) will look to make it 30 for 30 against undefeated 2016 Brazilian Olympic gold medalist Robson Conceição on Friday, Sept. 10 from the AVA Amphitheater at Casino Del Sol in Tucson, Arizona. A native of Nogales, Mexico, Valdez moved to Tucson as a young child and spent his elementary school years there before returning to Mexico. In the 10-round co-feature, undefeated junior lightweight star Gabriel Flores Jr., from Stockton, California, will fight Mexican veteran Luis Alberto Lopez. #ValdezConceicao and Flores Jr.-Lopez will stream live and