Oliver McCall Oliver McCall Oliver McCall (born April 21, 1965) is an American former professional boxer who competed from 1985 to 2014. He is best known for winning the WBC heavyweight title in 1994 by scoring an upset knockout victory over Lennox Lewis. The next year he defended the title against Larry Holmes before losing it to Frank Bruno. McCall would also become known for an in-ring mental breakdown during his 1997 rematch with Lewis. Known as "The Atomic Bull", McCall turned pro in 1985 and slowly worked his way up the heavyweight ranks. He beat Jesse Ferguson and future heavyweight champion
Heavyweight boxing championship records and statistics United Kingdom tied USA for most wins in WBO Heavyweight title fights with 8. WBO struggled with receiving credibility at first, but by the beginning of the 2000s, the WBA was giving the same recognition to WBO champions as it did to WBC and IBF champions. WBO, WBC, IBF and WBA are all recognized as major boxing organizations by each other and the International Boxing Hall of Fame. Riddick Bowe remains the only heavyweight boxer to win all four world titles (WBA, WBC and IBF in 1992–93 and WBO in 1995), while Vitali and Wladimir Klitschko are the only brothers