Muhammad Ali KO'd Sonny Liston with 'Phantom Punch' 51 years ago today

On May 25, 1965 in Lewiston, Maine, Muhammad Ali knocked out Sonny Liston with a punch so quick that few people, even those sitting ringside, saw it happen.

The bout lasted just 132 seconds and produced one of the most iconic images in sports history. To this day, there's still debate about whether Liston took a dive.