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Muhammad Ali, the scientific boxer
http://cherrycanoe.files.wordpress.com/2008/09/muhammad_ali_versus_sonny_liston.jpg
Without a doubt, it is Flloyd Mayweather Jr. He was born and bred to be a supreme champion! His entire childhood he was kept locked away in a cage and only allowed to see daylight during a fight;-) 
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http://www.imdb.com/name/nm0000738/
"Floating, stinging, punching, prophesying, he transformed his sport and became the world's most adored athlete" - George Plimpton
http://www.time.com/time/time100/heroes/profile/ali01.html
Check this video for how great he was:
http://video.google.com/videoplay?docid=2448048699588063388