Las Vegas: As Manny Pacquiao and Floyd Mayweather limber up for Saturday's welterweight "fight of the century," a look at five great bouts that captured the public imagination:

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Manny Pacquiao and Floyd Mayweather. Pic/AFP

'The fight'
Joe Frazier-Muhammad Ali, March 8, 1971: Known simply as "The Fight," Ali-Frazier I pitted the two undefeated heavyweight champions in the famed Madison Square Garden, New York with seemingly the whole world watching and taking sides.