Some of the most exciting moments of Robert "The Ghost" Guerrero's action-packed career. Guerrero battles Marcos Maidana Saturday, August 27, on HBO. For more 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.