Undefeated heavyweight contender Anthony Joshua has 15 knockouts ina 15 troideanna gairmiúla. Check out this video compilation from SHOWTIME Sports showcasing all of Joshua’s KOs. And tune in Dé Sathairn to watch the 2012 British Olympic Gold Medalist challenge undefeated American titlist Charles Martin for the IBF Heavyweight World Championship, beo ar Showtime ag 5 p.m. AGUS/2 p.m. PT from The O2 in London.