By Justin Barrasso Alvarez cemented himself as one of the greatest pound-for-pound fighters against Gennady Golovkin—and made it look easy. Canelo Alvarez dominated Gennady Golovkin in their trilogy bout, resoundingly putting an end to their long-standing rivalry. The 12-round bout was never in doubt, with Alvarez (58-2-2) attacking early. He controlled the first eight rounds, until Golovkin (42-2-1) finally showed signs of life in the ninth round. Age played a factor, as the 40-year-old Golovkin lacked the speed that made him such a force throughout his career. Prior to Saturday’s fight, the …