Two hard-hitting, former heavyweight national champions--Tye Fields of Las Vegas and Ed Mahone of Los Angeles-- highlight the undercard of the nationally televised show featuring former world champion Manuel Medina against Javier Alvarez in a 12-round, International Boxing Federation junior lightweight title-elimination bout presented by Golden Boy Promotions in association with Guilty Boxing Friday, March 24, at the Orleans Hotel & Casino in Las Vegas, Nev. [details]