2016 Summer Olympics

The 2016 Summer Olympics (Portuguese: Jogos Olímpicos de Verão de 2016), officially known as the Games of the XXXI Olympiad, and commonly known as Rio 2016, are a major international multi-sport event that will take place in Rio de Janeiro, Brazil, from August 5 to August 21, 2016. Record numbers of countries and sets of medals are awaiting in the games. More than 10,500 athletes from 206 National Olympic Committees (NOCs), including from Kosovo and South Sudan for the first time, will take part in this sporting event. With 306 sets of medals, the games will feature 28 Olympic sports — including rugby sevens and golf, which were added by the International Olympic Committee in 2009. These sporting events will take place on 33 venues in the host city and additionally on 5 venues in the cities of São Paulo (Brazil's largest city), Belo Horizonte, Salvador, Brasília (Brazil's capital), and Manaus.

The host city of Rio de Janeiro was announced at the 121st IOC Session held in Copenhagen, Denmark, on 2 October 2009. The other finalists were Madrid, Spain; Chicago, United States; and Tokyo, Japan. Rio will become the first South American city to host the Summer Olympics, the second city in Latin America to host the event after Mexico City in 1968, and the first since 2000 in the Southern Hemisphere. This will be the third time the Summer Olympics are held in a developing country, after the 1968 Games in Mexico and the 1988 Games in South Korea.

Men's 100 metres world record progression

The first record in the 100 metres for men (athletics) was recognised by the International Amateur Athletics Federation, now known as the International Association of Athletics Federations, in 1912. The record now is 9.58 seconds which was run by Usain Bolt.

As of 21 June 2011, the IAAF had ratified 67 records in the event, not including rescinded records.

Unofficial progression before the IAAF

IAAF record progression

Records 1912–1976

The first manual time of 9.9 seconds was recorded for Bob Hayes in the final of the 100 metres at the 1964 Olympics. Hayes' official time of 10.0 seconds was determined from the electronic time of 10.06 and rounding down to the nearest tenth of a second to give the appearance of a manual time. This method was unique to the Olympics of 1964 and 1968. The officials at the track recorded Hayes' time as 9.9 seconds.

Records from 1977

From 1975, the IAAF accepted separate automatically electronically timed records for events up to 400 metres. Starting January 1, 1977, the IAAF required fully automatic timing to the hundredth of a second for these events.