Krzysztof Zimnoch once defeated the current heavyweight boxing champion, who has held his title since what year?
Krzysztof Zimnoch Krzysztof Zimnoch (born September 6, 1983) is a Polish professional heavyweight boxer affiliated to the Hetman Białystok Boxing Club. He holds an amateur win over current WBC heavyweight champion Deontay Wilder.
Errol Spence Errol Spence Jr. (born March 3, 1990) is an American professional boxer who has held the IBF welterweight title since May 2017. As an amateur he won three consecutive United States national championships in the welterweight division and represented the U.S. at the 2012 Olympics, where he reached the welterweight quarter-finals. As of June 2017, Spence is ranked as the world's second best welterweight by "The Ring" magazine, third by the Transnational Boxing Rankings Board, and fourth by BoxRec.