Manny Pacquiao celebrates his 34th birthday on Monday. In this 2009 photo, Ricky Hatton lies motionless on the mat after being knocked down by Pacquaio during their fight in Las Vegas. (John Iacono/SI)

GALLERY: Manny Pacquiao’s Greatest Fights

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Manny Pacquiao retreats to his corner after knocking out Ricky Hatton during the second round of their 2009 fight. Will Pacquiao have as much success against Timothy Bradley when the two face off on Saturday? (Neil Leifer/SI) 

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GALLERY: Pacquiao and Bradley arrive in Las Vegas

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