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RIO DE JANEIRO, BRAZIL - AUGUST 05: Michael Phelps of the United States carries the flag during the Opening Ceremony of the Rio 2016 Olympic Games at Maracana Stadium on August 5, 2016 in Rio de Janeiro, Brazil. (Photo by Cameron Spencer/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 05:  Michael Phelps of the United States carries the flag during the Opening Ceremony of the Rio 2016 Olympic Games at Maracana Stadium on August 5, 2016 in Rio de Janeiro, Brazil.  (Photo by Cameron Spencer/Getty Images)

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RIO DE JANEIRO, BRAZIL - AUGUST 05: Flag bearer Michael Phelps of the United States and Ibtihaj Muhammad lead the U.S. Olympic Team during the Opening Ceremony of the Rio 2016 Olympic Games at Maracana Stadium on August 5, 2016 in Rio de Janeiro, Brazil. (Photo by Buda Mendes/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 05: Flag bearer Michael Phelps of the United States and Ibtihaj Muhammad lead the U.S. Olympic Team during the Opening Ceremony of the Rio 2016 Olympic Games at Maracana Stadium on August 5, 2016 in Rio de Janeiro, Brazil.  (Photo by Buda Mendes/Getty Images)

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RIO DE JANEIRO, BRAZIL - AUGUST 05: Flag bearer Michael Phelps of the United States leads the team entering the stadium during the Opening Ceremony of the Rio 2016 Olympic Games at Maracana Stadium on August 5, 2016 in Rio de Janeiro, Brazil. (Photo by Lars Baron/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 05:  Flag bearer Michael Phelps of the United States leads the team entering the stadium during the Opening Ceremony of the Rio 2016 Olympic Games at Maracana Stadium on August 5, 2016 in Rio de Janeiro, Brazil.  (Photo by Lars Baron/Getty Images)

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RIO DE JANEIRO, BRAZIL - AUGUST 05: Michael Phelps of the United States carries the flag during the Opening Ceremony of the Rio 2016 Olympic Games at Maracana Stadium on August 5, 2016 in Rio de Janeiro, Brazil. (Photo by Cameron Spencer/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 05:  Michael Phelps of the United States carries the flag during the Opening Ceremony of the Rio 2016 Olympic Games at Maracana Stadium on August 5, 2016 in Rio de Janeiro, Brazil.  (Photo by Cameron Spencer/Getty Images)

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RIO DE JANEIRO, BRAZIL - AUGUST 05: Flag bearer Michael Phelps of the United States leads the U.S. Olympic Team during the Opening Ceremony of the Rio 2016 Olympic Games at Maracana Stadium on August 5, 2016 in Rio de Janeiro, Brazil. (Photo by Ross Kinnaird/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 05:  Flag bearer Michael Phelps of the United States leads the U.S. Olympic Team during the Opening Ceremony of the Rio 2016 Olympic Games at Maracana Stadium on August 5, 2016 in Rio de Janeiro, Brazil.  (Photo by Ross Kinnaird/Getty Images)