PHOENIX, AZ - JULY 29:  Julio Cesar Chavez from Mexico (R) fights against Kostya Tszyu from Australia during the second round of their World Boxing Council Super Lightweight Championship  in Phoenix, Arizona 29 July, 2000. Russian-born Tszyu won by TKO in sixth round to retain his title. (ELECTRONIC IMAGE) AFP PHOTO MIKE FIALA/hmb  (Photo credit should read MIKE FIALA/AFP via Getty Images)