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Between them, Gennady Golovkin and Roman Gonzalez have won all 78 of their professional fights, 69 of them by knockout. Golovkin is the WBA/IBF/interim WBC middleweight champion, who is 34-0 with 31 knockouts in a dozen years as a pro. Gonzalez is the WBC flyweight champion who is 44-0 with 38 knockouts.