Manny Pacquiao -- Running His Mouth Before the Fight

Filed under: Manny Pacquiao, TMZ Sports

For the past week, Manny Pacquiao has been locked in several INTENSE training sessions ... so he can SING HIS FACE OFF at a big post-fight concert -- and TMZ has the footage. Pacquiao is rumored to hit the stage at the Mandalay Bay Hotel after he fights…

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