By Jason Gonzalez, Real Combat Media.com: Gennady Golovkin (36-0) took on Kell Brook (36-1) this Saturday at the O2 Arena in Greenwich, London. Golovkin won the fight by TKO in the fifth round after Brook’s corner decided that Brook had taken enough punishment. Leading up to the fight Golovkin was under major scrutiny for deciding to fight a guy who is two weight classes under him. Even though the fight did end early as many predicted boxing fans and critics learned at least one thing that night; Golovkin can be hurt. It was obvious from round one that Golovkin’s power was to much for Brook, but there was several times where Golovkin did look vulnerable. This is something that had not been seen before. Before this fight it looked like Golovkin was this invisible monster at Middleweight who would destroy Saul Canelo Álvarez. Now it seems as if Golovkin has a chink in his armor.