Pacquiao vs Mayweather Boxing Match: Who would likely win?

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I've never seen any Mayweather match before so I don't know how good he is. But I did read that he is a defensive fighter and the former pound for pound king. This would be an interesting match up. The new king versus the former king. Personally I think Pacquiao would win the fight. But it would be a hard fought fight since Mayweather according to what I have read is almost as fast Pacquiao. Who do you think would likely win the match and why?