By Tom Goldman

Michael Phelps added to his Olympic record, winning a 19th gold medal on Sunday night, while American Katie Ledecky smashed her own world mark in the 400-meter freestyle at the Summer Games.

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Source:: http://www.npr.org/2016/08/08/489138595/in-rio-olympics-swimers-katie-ledecky-and-michael-phelps-win-gold?utm_medium=RSS&utm_campaign=sports