Victor Ortiz is the obvious answer from recent times. I'm trying to think of who else there is recently......
Cintron (Sergio's "headbutt", jumping out of ring) Dirrell (punch reaction, fight negotiation BS, "headaches" outta nowhere, withdrawal) Margarito (plaster gloves has to make the list... absolutely no heart in the sport if you treat it like that)
if they had a glass heart, you would most likely have never heard of them....they would have quit way before they became world-class
Stefan "Kretsche" Kretschmann [ame="http://www.youtube.com/watch?v=njyt3tq6Ios"]http://www.youtube.com/watch?v=njyt3tq6Ios[/ame]