Not surprised at, all injuries happen all the time in pro sports. Especially when a boxer is getting older.
Wlad is a big body and he's no spring chicken.... He has no reason to duck Chisora. I will give him the benefit of the doubt that he is legitimately suffering from a back injury.
This has happened a lot. Tyson was prone to bronchitis and had to postpone a few bouts because of it.
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