Top 10 CONCUSSIVE KOs!!! Marquez, Berto, Lacy... NASTIEST KNOCKOUTS from the Gary Shaw archive

We delve into the wondrous Gary Shaw archive and select 10 of the finest and most devastating knockouts. Subscribe for updates - Enter The KO Cup - More boxing news 24/7: Follow on Twitter: Like on Facebook: SecondsOut is a world leader in boxing entertainment since 1999. Part of the Knockout TV YouTube MCN -