Undefeated heavyweight contender Anthony Joshua has 15 knockouts í hans 15 faglega berst. Check out this video compilation from SHOWTIME Sports showcasing all of Joshua’s KOs. And tune in laugardag að horfa á 2012 British Olympic Gold Medalist challenge undefeated American titlist Charles Martin for the IBF Heavyweight World Championship, lifa á Showtime á 5 p.m. OG/2 p.m. PT from The O2 in London.