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Some of the best remembered moments in MMA history are the times when there has been a genuine changing of the guard. When Georges St. Pierre knocked out Matt Hughes with a head kick, it marked the end of the era in which Hughes was the welterweight king and began the St. Pierre era. Antonio Rodrigo Nogueira was dominant in the Pride Fighting Championships heavyweight division -- until Fedor Emelianenko came along and proved to be Nogueira’s kryptonite.