ESPN

Greatest upsets of past 25 years

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Corrie Sanders-Wladimir Klitschko

Photograph By Andreas Rentz/Bongarts/Getty Images

March 8, 2003: Before joining forces with trainer Emanuel Steward and fully embracing the art of defense, current and then-heavyweight champ Wladimir Klitschko was shocked by Corrie Sanders in a second-round knockout in Hannover, Germany.