WBA middleweight champion Gennady “GGG” Golovkin (26-0, 23 KO) has broken almost every challenger he’s faced in his career. On Saturday night from the MGM Grand at Foxwoods Resort in Mashantucket, Conn., Matthew “Mack the Knife” Macklin (29-4, 20 KO) will attempt to be GGG’s sturdiest test.
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