Undefeated heavyweight contender Anthony Joshua has 15 knockouts i roto i tona 15 whawhai ngaio. Check out this video compilation from SHOWTIME Sports showcasing all of Joshua’s KOs. And tune in tenei Rāhoroi to watch the 2012 British Olympic Gold Medalist challenge undefeated American titlist Charles Martin for the IBF Heavyweight World Championship, ora i runga i SHOWTIME i 5 p.m. AND/2 p.m. PT from The O2 in London.