Acronyms of the santioning organizations include the World Boxing Council (WBC), World Boxing Association (WBA), International Boxing Federation (IBF) and World Boxing Organization (WBO).

HEAVYWEIGHT (unlimited)

WBC: Samuel Peter, 30-1 (23 KOs), 27 years old, Nigerian

WBA: Ruslan Chagaev, 24-0-1 (17 KOs), 29, Uzbekistanian

IBF: Wladimir Klitschko, 50-3 (44 KOs), 32, Ukrainian

WBO: Klitschko

CRUISERWEIGHT (190 pounds)

WBC: David Haye, 21-2 (20 KOs), 27, British

WBA: Haye and Firat Arslan, 29-3-1 (18 KOs), 37, German

IBF: Steve Cunningham, 21-1 (11 KOs), 31, American (Philadelphia native)

WBO: Haye

LIGHT HEAVYWIGHT (175 pounds)

WBC: Chad Dawson, 26-0-1 (17 KOs), 25, American

WBA: Danny Green, 25-3 (22 KOs), 25, Australian

IBF: Antonio Tarver, 27-4 (19 KOs), 39, American

WBO: Zsolt Erdei, 29-0 (17 KOs), 33, Hungarian

SUPER MIDDLEWEIGHT (168 pounds)

WBC: Joe Calzaghe, 44-0 (32 KOs), 36, Welsh

WBA: Calzaghe and Anthony Mundine, 31-3 (23 KOS), 32, Australian

IBF: Lucian Bute, 22-0 (18 KOs), 28, Romanian

WBO: Calzaghe

MIDDLEWEIGHT (160 pounds)

WBC: Kelly Pavlik, 32-0 (29 KOs), 26, American

WBA: Felix Sturm, 29-2-1 (13 KOs), 29, German

IBF: Arthur Abraham, 26-0 (21 KOs), 28, German

WBO: Pavlik