Who did klitschko lose to?

Vitali Klitschko lost to Lennox Lewis in a heavyweight title fight on June 21, 2003, which was stopped due to a cut over Klitschko's eye, resulting in a TKO victory for Lewis. Wladimir Klitschko, his brother, lost to Tyson Fury on November 28, 2015, in a unanimous decision and to Anthony Joshua on April 29, 2017, in a dramatic fight that ended with an 11th-round knockout.