I will be supporting Brook as I cannot resist an underdog, but my head says he gets flattened in 6 rounds. Brook might start quick, but once he feels the power, he will be questioning what he is doing and I can see it being downhill from there. Golovkin is an all round fighter and has taken punches and dished out a lot more at the weight. He seldom goes the distance. I don't see what Brook has to stop that run of destruction.