By his account he floated like butterfly and stung like a bee. According to Sports Illustrated and the BBC, he was the sportsman of the 20th century. That honor would have come as no surprise to the three-time world heavyweight champion who always said he was the greatest.

Originally released by Switch International, 2007. Streaming video file encoded with permission for digital streaming by Infobase on May 06, 2015.

Muhammad Ali: The Greats (5:00); .