Originally posted on Pro Boxing Fans  |  Last updated 5/30/13
When Russian knockout sensation Sergey "Krusher" Kovalev, 20-0-1, 18 KOs, squares off against Houston's Cornelius White, 21-1, 16 KOs, the light heavyweight contender will have a not-so-secret weapon in his corner. Over the last year, Kovalev has been working with former world champion John David Jackson, who in recent years has become a standout as a boxing trainer. Before becoming a trainer, John David Jackson had an excellent boxing career that included world titles in both the junior middleweight and middleweight divisions, and an overall pro record of 36-4, 20 KOs. In his post-punching era, Jackson has worked with fighters like Bernard Hopkins, Shane Mosley, Nate Campbell, Randall Bailey, and others. Now, his latest charge, Kovalev, is quickly climbing the ranks toward a world title shot. "He's a tremendous puncher, probably the most pure puncher in the division," Jackson said. "I don't try to change anything he does because his style is very unique. It's not conventional. He punches
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