Gennady Golovkin is slowly shaping up to be one of the scariest men in boxing. He is counting like flies - 18 consecutive to be exact - the number of men he placed face flat on the floor after each fight. The last one was so devastating and so quick that most boxing observers are ready to anoint him as the boxer chasing the heels of the top of the echelon such as Floyd Mayweather Jr. and Manny Pacquiao.

With his latest win over Marco Antonio Rubio in the second round last weekend, he retains his middleweight world title and more importantly, sets him up for bigger things to come in the boxing world. The Kazakh boxer is aware of his knockout prowess as evidenced by how he described how he won the last bout with just a shade of two minutes elapsing in the second round against the Mexican.

View the slideshow as we examine some of the best names out there who could possibly give a challenge to boxing's rising star.