World heavyweight boxing champion Vladimir Klitschko will defend his WBA, WBO, IBF and IBO titles against undefeated Bulgarian Kubrat Pulev in Hamburg in September.
The 38-year-old Ukrainian Klitschko has been a heavyweight champion since 2006.
He was the 1996 Olympic champion and has an outstanding record as a professional of 52 knockouts in 62 wins.
The 33-year-old Pulev, who has 11 knockouts from 20 wins, became the IBF international champion in 2011 and European champion in 2012.