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Now I'm not putting Roach in this list just because of his success with Pacquiao in recent years. The reason Freddie Roach will be a major factor in this fight is because he actually has experience against Floyd.
The fight between Mayweather and De La Hoya back in 2007 ended in a split decision. While Oscar—to me—clearly didn't win the fight, he was always in it, which is very important. Oscar was able to corner Floyd at certain times and just hammer him with punches, although not so successful at it.
But just the fact that he was able to do so and keep the fight competitive for all 12 rounds tells me something about Freddie Roach's ideas or plans on how to beat Mayweather. Roach constantly claims he knows how to beat Mayweather, especially with a guy like Pacquiao to do the job.
Now I'm not one to just believe that because he says so, but looking back at while he was in Oscar's corner he gave Floyd the most competitive fight in about four or five years. While in Pacquiao's corner against Mayweather Sr's fighter, Ricky Hatton, he had a second round KO.
Maybe Roach is the kryptonite to the Mayweather name.