U.S. swimmer Michael Phelps broke the Olympics' most hallowed record Sunday by winning an unprecedented eight gold medals in a single Games.
In modern Olympic history, no athlete has accomplished that feat. Until now, U.S. swimmer Marc Spitz's seven gold medals in the 1972 Games was the number to beat.
Phelps tied Spitz's record on Saturday in the 100-meter butterfly, winning by 0.01 of a second. 
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CNN's Christine Theodorou contributed to this report.
All About Michael Phelps • Sports • Competitive Swimming • Olympic Games
