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Undefeated Shawn Porter stopped former world champion Paulie Malignaggi in the fourth round Saturday to retain his International Boxing Federation welterweight crown. Porter improved to 24-0 with one draw by hammering Malignaggi before the all-American showdown was stopped 74 seconds into the fourth round, his 15th triumph inside the distance. Malignaggi, 33, fell to 33-6 in what might have been his final career bout. "A really great fighter beat me," said Malignaggi.