Which South African professional boxer did  Cedric Kushner managed
Corrie Sanders Cornelius Johannes "Corrie" Sanders (7 January 1966 – 23 September 2012) was a South African professional boxer who competed from 1989 to 2008. He won the WBO heavyweight title in 2003 after stopping Wladimir Klitschko in two rounds, which was considered one of the biggest upsets in heavyweight boxing history; "The Ring" magazine named it the Upset of the Year. In 2004, having vacated the WBO title, Sanders faced Wladimir's brother Vitali Klitschko in an unsuccessful challenge for the vacant WBC and "Ring" heavyweight titles.
Ike Ibeabuchi Ikemefula Charles "Ike" Ibeabuchi (born February 2, 1973) is a Nigerian former professional boxer who competed from 1994 to 1999 in the heavyweight division. He defeated highly ranked contender David Tua in 1997 and future world champion Chris Byrd in 1999. After compiling a record of 20–0 with 15 knockouts, Ibeabuchi was imprisoned in Las Vegas in July 1999, after submitting an Alford plea. In November 2015, Ibeabuchi was released from the custody of United States Immigration and Customs Enforcement (ICE) after completing his 16-year Nevada state prison sentence without incident. He announced his desire to return to the ring to resume his professional boxing career, but was rearrested before a comeback could take place.