Undefeated heavyweight contender Anthony Joshua has 15 knockouts in zijn 15 professionele gevechten. Check out this video compilation from SHOWTIME Sports showcasing all of Joshua’s KOs. And tune in deze zaterdag om het horloge 2012 British Olympic Gold Medalist challenge undefeated American titlist Charles Martin for the IBF Heavyweight World Championship, live op Showtime om 5 p.m. EN/2 p.m. PT from The O2 in London.