Watch Team USA's Tribute to Muhammad Ali

Muhammed Ali's participation in the opening ceremony of London 2012 was a pleasant surprise.

His starring role at the Atlanta games in 1996 was even more surprising.

And while the past 8 years have seen Parkinson's Disease claim even more of the great man's physical prowess, his status as a sporting icon remains as strong as ever.

Bonus:

Here's 10 of Ali's greatest quotes.