Phelps powered to victory in his signature event, the 200-meter butterfly, then came back an hour later to anchor the strong U.S. men’s 4×200 freestyle relay, winning his second and third gold medals, respectively, of the Rio Olympic Games and the 20th and 21st of his career.

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http://www.usatoday.com/story/sports/columnist/brennan/2016/08/09/brennan-why-michael-phelps-200-fly-olympic-gold-sweet-gets/88503152/