He won the WBA title by beating Nikolai Valuev over 12 rounds in November 2009 and has defended his title twice .
Klitschko has held the IBF belt since 2006 .
He won the WBA title by beating Nikolai Valuev over 12 rounds in November 2009 and has defended his title twice , while Klitschko has held the IBF belt since 2006 .