Undefeated heavyweight contender Anthony Joshua has 15 knockouts a cikin 15 professional fights. Check out this video compilation from SHOWTIME Sports showcasing all of Joshua’s KOs. Kuma tune a wannan Asabar to watch the 2012 British Olympic Gold Medalist challenge undefeated American titlist Charles Martin for the IBF Heavyweight World Championship, zauna a Showtime a 5 p.m. DA/2 p.m. PT from The O2 in London.