Undefeated heavyweight contender Anthony Joshua has 15 knockouts nyob rau hauv nws 15 kev sib ntaus. Check out this video compilation from SHOWTIME Sports showcasing all of Joshua’s KOs. And tune in no hnub vas xaum to watch the 2012 British Olympic Gold Medalist challenge undefeated American titlist Charles Martin for the IBF Heavyweight World Championship, nyob rau SHOWTIME ntawm 5 p.m. THIAB/2 p.m. PT from The O2 in London.