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Terence Crawford knocked out Errol Spence at 2:32 of the ninth round to become the first man to win the undisputed 147-pound championship in the four-belt era Saturday at T-Mobile Arena in Las Vegas.
He also became the first man to capture all four major titles in a second division
Crawford (40-0, 31 KOs) put Spence (28-1, 22 KOs) down three times in his dominating performance.
Check out the knockout in the video above.
