A man works on the Tennis venue at the Olympic Park for the 2016 Olympics in Rio de Janeiro, Brazil, Monday, March 23, 2015. The head of Rio de Janeiro's Olympic organizing committee Carlos Nuzman said Rio would emerge from the games more changed than 1992 host Barcelona or 1964's Tokyo. (AP Photo/Leo Correa)
A worker carries a equipment as he walks past Aquatic Stadium under construction at the Olympic Park of the 2016 Olympics in Rio de Janeiro, Brazil, Monday, March 23, 2015. The head of Rio de Janeiro's Olympic organizing committee Carlos Nuzman said the 2016 games will be the motor of the biggest urban transformation of any Olympic city. (AP Photo/Leo Correa)
FILE - This is a Sunday Oct. 1, 2000 file photo of Audley Harrison of Britain celebrates his gold medal victory in the super-heavyweight division in Sydney, Australia. Former Olympic boxing champion Audley Harrison has announced his retirement, saying repeated blows to the head have left him with brain injuries. The 43-year-old British fighter, who won the super-heavyweight gold medal at the 2000 Sydney Olympics, says a series of medical tests showed he was suffering the effects of traumatic brain injury. (AP Photo/Laura Rauch, File)
Today on Yahoo
Olympic, Olympiad, the Olympic rings, Faster Higher Stronger, Citius Altius Fortius and related marks are owned by the International Olympics Committee, the London Organizing Committee of the Olympic Games and Paralympic Games, or their related entities. This site is neither endorsed by nor affiliated with any of these entities.