NEW YORK – SHOWTIME will kick off the Cinco de Mayo weekend with the first of excellent back-to-back fight cards on Friday, May 5. In the main event on “ShoBox: The New Generation” (11 p.m. ET/PT, delayed on the west coast), North American Boxing Association (NABA) flyweight champion Cesar “El Gallito’’ Lopez (18-2, four KOs) defends against Glenn “The Filipino Bomber” Donaire (15-2-1, nine KOs). The vacant North American Boxing Organization (NABO) 112-pound belt will also be on the line in the 12-round bout. [details]