Stone-fisted boxer Sergey "Krusher" Kovalev (27-0-1, 24 KOs) has not yet tasted defeat as a professional, but that record and his WBA, IBF and WBO light heavyweight titles will be put on the line Saturday evening when he takes on mandatory challenger Nadjib Mohammedi (37-3, 23 KOs) in a scheduled 12-round match at the Mandalay Bay Resort and Casino in Las Vegas.
Kovalev's career has been a rather straightforward ascent to the top of the light heavyweight division, and he's looked...