TOPSHOT - Combination picture made on August 14, 2016 shows US swimmer Michael Phelps with the 23 gold medals he won at the Olympic Games in Athens 2004, Beijing 2008, London 2012 and Rio 2016. / AFP / - (Photo credit should read -/AFP/Getty Images)

TOPSHOT - Combination picture made on August 14, 2016 shows US swimmer Michael Phelps with the 23 gold medals he won at the Olympic Games in Athens 2004, Beijing 2008, London 2012 and Rio 2016. / AFP / -        (Photo credit should read -/AFP/Getty Images)