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.
Joshua Onyango Joshua "Poison" Onyango ( (1975--) 01 1975 (age (2017)-(1975)-((11)<(12)or(11)==(12)and(30)<(01)) ) ) born in Kisumu, is a Kenyan professional welter/light middle/middleweight boxer of the 1990s, 2000s and 2010s who won the Kenya welterweight title, East & Central African Professional Boxing Federation welterweight title, and Commonwealth light middleweight title, and was a challenger for the International Boxing Federation (IBF) Inter-Continental light welterweight title against Sergey Bashkirov, his professional fighting weight varied from 144 lb , i.e. Welterweight to 160 lb , i.e. Middleweight.