MMA world.The 28-year-old delivered the blow during the fourth round during the main event to retain his bantamweight title at Mohegan Sun in Uncasville, Connecticut.It’s been called the best KO of the year, and only Pettis’ fourth KO/TKO in 27 career fights."I came out here and got beat up for four rounds pretty much," Pettis said postfight. "I was just like, 'Man, I'm losing this fight.
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