Undefeated heavyweight contender Anthony Joshua has 15 knockouts ninu re 15 ọjọgbọn njà. Check out this video compilation from SHOWTIME Sports showcasing all of Joshua’s KOs. And tune in yi Saturday to watch the 2012 British Olympic Gold Medalist challenge undefeated American titlist Charles Martin for the IBF Heavyweight World Championship, gbe lori Showtime ni 5 p.m. ATI/2 p.m. PT from The O2 in London.