<Tr> <Td_colspan="2"> Juan Manuel Márquez via 6th round KO </Td> </Tr> <P> Manny Pacquiao vs. Juan Manuel Márquez IV, billed as Fight of the Decade, was a professional boxing match . It was also billed unofficially as deciding the World Boxing Organization's "Champion of the Decade". This was the fourth and final meeting between Manny Pacquiao and Juan Manuel Marquez . The bout was held on December 8, 2012, at the MGM Grand in Las Vegas, Nevada and drew 1.15 million pay - per - view buys . </P> <P> Marquez defeated Pacquiao by knockout with one second remaining in the sixth round . It was named Fight of the Year and Knockout of the Year by Ring Magazine, with round five garnering Round of the Year honors . </P> <P> Manny Pacquiao and Juan Manuel Marquez . </P>

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