Chagaev slowly but steadily climbed up the heavyweight ranks , first avenging the no - contest with a brutal second round knockout of Calloway , then beating undefeated Ukrainian prospect Vladimir Virchis in a close and intense punchfest , and slowly took apart prominent British boxer Michael Sprott .
Chagaev slowly but steadily climbed up the heavyweight ranks , first avenging the no - contest with a brutal second round knockout of Calloway . 
 In 2006 he beat undefeated Ukrainian prospect Vladimir Virchis in a close and intense punchfest , and slowly took apart prominent British boxer Michael Sprott .