NEW YORK – Travis Walker and Raphael Butler knocked down then-World Boxing Council (WBC) heavyweight champion Vitali Klitschko during sparring in late 2005, according to trainer Dickie Wood.

"I was very close to stopping the fight. The whole 10th and 11th round, I was close by. Most of the other parts of the fight, I stayed away from them, so that you can see the vision of their ...