In August, Slice, who turned pro, took the four-rounder 39-37 as his opponent frustrated him.
Hackmann enjoyed an excellent second round, rocking Slice back on the ropes as he looked tired.
But the pre-fight fodder failed to land anything substantial in the following rounds.
FOUR ROUNDS
He can hold his head up high after becoming the first boxer to go past the first round against the brawler from Miami.
Fitness trainer Hackmann was expected to be blown out in Kimbo’s usual first-round fashion. But the Peak Physique lead coach hung in there and used his know-how to hear the final bell.
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