#boxing #boxinghighlights #ArturBeterbiev #CallumJohnson Artur Beterbiev knocked out Callum Johnson at 2:36 of the fourth round on October 6, 2018, at Wintrust Arena in Chicago, Illinois, retaining his IBF light heavyweight title. Johnson stunned Beterbiev with a knockdown in the second round, but Beterbiev recovered, dropped Johnson in the first and fourth rounds, and finished him with a powerful barrage of punches.