Wladimir Klitschko has fought in 19 heavyweight title fights .
Overall , he became the second-longest reigning heavyweight champion of all time , and has the second-most successful title defenses total of any heavyweight boxer with 13 ( including his initial reign as WBO champion ) , behind Joe Louis ( 15 ) and ahead of Larry Holmes ( 10 ) and Muhammad Ali ( 9 ) .
Wladimir Klitschko