USA's Nathan Adrian looks on after competing in the Men's 50m Freestyle Semifinal during the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 11, 2016. / AFP / CHRISTOPHE SIMON (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)
USA's Nathan Adrian looks at the results board after competing in a Men's 50m Freestyle heat during the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 11, 2016. / AFP / CHRISTOPHE SIMON (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)
USA's Nathan Adrian looks on after competing in a Men's 50m Freestyle heat during the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 11, 2016. / AFP / CHRISTOPHE SIMON (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)
USA's Nathan Adrian prepares to compete in the Men's 50m Freestyle Semifinal during the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 11, 2016. / AFP / Martin BUREAU (Photo credit should read MARTIN BUREAU/AFP/Getty Images)
USA's Nathan Adrian (L) and France's Florent Manaudou react after competing in the Men's 50m Freestyle Semifinal during the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 11, 2016. / AFP / Odd Andersen (Photo credit should read ODD ANDERSEN/AFP/Getty Images)
