One of my fave fighter(top 10). But man bravest with the heart won't run against a smaller man for 6- 12 rounds.
Miguel Cotto is one of my favs but i dont know about his heart is THAT big. When the going gets tough he gets on his bike Ex: Margarito, Pacquiao. I think the title of "Fighter with the biggest balls" should go to a man who fights to the bitter end or gets knocked out trying. Ex: Gatti, , Margarito, Jorge Arce etc etc.
Adamek I'm not sure if Toney counts but after being a former MW and eventually facing a big HW in Peter I have to admit that he's got balls. Also fought prime Jones though he's not as big of a puncher.
I think every boxer whether or pro or amateur has balls for taking the courage to even get into the ring for a sanctioned match..