Michael Fred Phelps II (born June 30, 1985) is a retired American swimmer and the most decorated Olympian of all time, with a total of 22 medals. Phelps also holds the all-time records for Olympic gold medals (18, double the second highest record holders), Olympic gold medals in individual events (11), and Olympic medals in individual events for a male (13).
Ronda Jean Rousey -- born February 1, 1987, is an American mixed martial artist, judoka (practitioner of judo) and actress. She is the f irst and current UFC Women's Bantamweight Champion, as well as the last Strikeforce Women's Bantamweight Champion. She is undefeated, having won nine of her eleven fights by armbar. Rousey became the first American woman to earn an Olympic medal in Judo at the Summer Olympics in Beijing in 2008.
Usain Bolt of Jamaica celebrates winning the Men's 100m Final and the gold medal at the National Stadium on Day 8 of the Beijing 2008 Olympic Games on August 16, 2008 in Beijing, China. Bolt finished the event in first place with a time of 9.69, a new World Record. (Photo by Mike Hewitt/Getty Images)
Jamaica's Usain Bolt became the first athlete to win three Olympic 100m titles by beating American Justin Gatlin to gold at Rio 2016. Bolt, 29, ran 9.81 seconds in his final Olympics to replicate his success at Beijing 2008 and London 2012. Twice banned for doping offences, Gatlin was 0.08 seconds behind Bolt, with Canada's Andre de Grasse in third.