An extraordinary undercard will feature Canelo Alvarez, the 21 year old Mexican phenom and the legendary Erik Morales. Mayweather vs. Ortiz happens Sat., Sept., 17 live on pay-per-view. For more information on HBO Boxing, visit . br br Watch HBO Sports series and events online at HBO GO® br With HBO GO, you can watch your favorite HBO Sports series and events on your iPad® (), iPhone® () or Android™ () smartphone. Free with your HBO subscription through participating TV providers.