I think in many cases it's a bad idea. I believe they essentially "tip their hand" and ultimately give their opponent a huge advantage. If I'm fully aware that my opponent is planning to knock me out, I'm going to make necessary adjustments and may even catch him being overly aggressive.
I understand that fighters do this all the time, especially the knockout artists, but there have been situations where fighters were better off keeping their mouths shut. Khan, Pavlik vs Hopkins, Hearns vs Hagler...to name a few.
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