Came back from retirement to win a gold medal at the age of 37 in the high jump at the Rio Olympics. She had retired after finishing fourth in London in 2012, but was so upset by her failure to win an Olympic medal that she returned and succeeded in Rio.
(United States) Swimming
Michael Phelps, the most decorated Olympian of all time, produced one of the most amazing comebacks in the history of sport when he won five gold medals and one silver at the Olympics in Rio. He has now won 28 medals, including 23 gold.
After injury, he started the year ranked 1,042, but defeated Novak Djokovic in the first round at the Rio Olympics eventually winning the silver medal. In November he came back from two sets down to beat Marin Cilic to help Argentina win the Davis Cup.
Competed at the Rio Olympics after recovering from salivary gland cancer the previous year. She needed two operations that resulted in face paralysis for three months. Unfortunately had to drop out after the swim with a foot problem.
(United Kingdom) Equestrian
Despite breaking his neck in two places in 2000, he became the oldest British Olympic champion since 1908, at 58 years and 233 days, when he won the individual show jumping gold medal on Big Star in Rio. It was his seventh Olympic Games.
The double World Cup champion and Olympic gold medallist missed the entire World Cup season in 2015 with an Achilles tendon injury. But he returned at the start of 2016 and had a remarkable seven World Cup victories in less than two months.