Undefeated heavyweight contender Anthony Joshua has 15 knockouts i hans 15 professionella slagsmål. Check out this video compilation from SHOWTIME Sports showcasing all of Joshua’s KOs. And tune in denna lördag to watch the 2012 British Olympic Gold Medalist challenge undefeated American titlist Charles Martin for the IBF Heavyweight World Championship, leva på SHOWTIME på 5 p.m. OCH/2 p.m. PT from The O2 in London.