IBF Bantamweight Champion Leo Santa Cruz defends his title against Alberto Guevara live on Saturday in the first CBS boxing telecast in 15 years (4:30 p.m. ET/1:30 p.m. PT). But the undefeated champion will be fighting with a greater purpose on Saturday – to help find a cure for his brother, Roberto, who suffers for a debilitating and potentially life-threatening disease. Check out this poignant video featuring an inside glimpse into the Santa Cruz family and their quest to provide a better life for Roberto.