For me its Manny Paquiao. Who watched his last fight with a British guy named Ricky Hatton? Hatton was knocked out by Paquiao within two rounds only!!!
No not really Chuck Norris. Who knows who was the best... But I know one fighter who probably is the best right now: George St Pierre - UFC - Probably the best pound-for-pound fighter today. Go Canada!
He delievered one of the finest knock-out punches I've ever seen. The guy is a genius, and certainly up there in the top ten of greatest fighters of all time.
I go with Manny Pacquiao too. He became the first Filipino and Asian boxer to win five world titles in five different weight divisions. Wow, how great he is!