By Harry Davies Drake lost a massive $600,000 bet after Anthony Joshua knocked out Francis Ngannou in their heavyweight showdown. The award-winning rapper first gained notoriety for betting on fights two years ago and has since recorded some big wins and losses. Drake’s latest six-figure bet was placed on former UFC champion Ngannou to beat Joshua and he would have pocketed just under $2million if the gamble paid off. Joshua started off strong as he did what Tyson Fury couldn’t by putting Ngannou down in the opening round when he landed a big right hand. Ngannou was able to compose himself and…