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Khan-Judah - Zab Judah preparing for the weigh-in Friday at the Mandalay Bay Events Center. (Photo: Marcus Vanderberg)

Photo By Photo: Marcus Vanderberg

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Khan-Judah - Zab Judah weighed in at 140 pounds. (Photo: Marcus Vanderberg)

Photo By Photo: Marcus Vanderberg

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Khan-Judah - Amir Khan also tipped the scales at 140 pounds. (Photo: Marcus Vanderberg)

Photo By Photo: Marcus Vanderberg

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Khan-Judah - Amir Khan and Zab Judah pose for the cameras.  (Photo: Marcus Vanderberg)

Photo By Photo: Marcus Vanderberg

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Khan-Judah - Amir Khan throws a left at Zab Judah during their super lightweight world championship unification bout at the Mandalay Bay Events Center. (Photo: Scott Heavey/Getty Images)

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Khan-Judah\r  - Amir Khan knocks out Zab Judah in the fifth round following a punch that appeared to be a low blow at first glance.\r \r(Photo: Scott Heavey/Getty Images)

Photo By Photo: Scott Heavey/Getty Images

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Khan-Judah - Following the fight, Amir Khan's team announced he would be moving up to 147 pounds starting in 2012 and would love to challenge Manny Pacquiao or Floyd Mayweather Jr. (Photo: Marcus Vanderberg)

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Khan-Judah\r - Zab Judah felt the punch Amir Khan landed in the fifth round was a low blow and he plans to appeal the loss.\r \r(Photo: Marcus Vanderberg)

Photo By Photo: Marcus Vanderberg

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Khan-Judah - Zab Judah's trainer, Pernell Whitaker, thought the punch was low. "To me, if it's below the part with the name [on the trunks], it's a low blow." (Photo: Marcus Vanderberg)

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Khan-Judah - Zab Judah's daughters holding their father's championship belts following the fight. (Photo: Marcus Vanderberg)

Photo By Photo: Marcus Vanderberg