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WATCH & READ
Olympic Update: 8/12
1:45
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Many casual swimming fans were probably perplexed on Friday night when Michael Phelps finished in a three-way tie for silver in the 100-meter butterfly -- his final individual race of the 2016 Rio Olympics and, most likely, ever.
Just the night before, American Simone Manuel tied for gold in the 100-meter freestyle with 16-year-old Canadian Penny Oleksiak.
So why are there so many ties in swimming?
