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The 100 metres, or 100-metre dash, is a sprint race in track and field competitions. The shortest common outdoor running distance, it is one of the most popular and prestigious events in the sport of athletics. It has been contested at the Summer Olympics since 1896 for men and since 1928 for women.

Athletics
100 metres
London 2012 Olympic 100m final start.jpg
Start of the 100 metres final at the 2012 Olympic Games.
Men's records
World Jamaica Usain Bolt 9.58 (2009)
Olympic Jamaica Usain Bolt 9.63 (2012)
Women's records
World United States Florence Griffith-Joyner 10.49 (1988)
Olympic United States Florence Griffith-Joyner 10.62 (1988)

The 100 metres, or 100-metre dash, is a sprint race in track and field competitions. The shortest common outdoor running distance, it is one of the most popular and prestigious events in the sport of athletics. It has been contested at the Summer Olympics since 1896 for men and since 1928 for women.

File:Women's 100M Final - 28th Summer Universiade 2015 Gwangju.webmPlay media
Women's 100M Final - 28th Summer Universiade 2015

The reigning 100 m Olympic champion is often named "the fastest runner in the world." The World Championships 100 metres has been contested since 1983. Jamaicans Usain Bolt and Shelly-Ann Fraser-Pryce are the reigning world champions, Bolt and Elaine Thompson are the Olympic champions in the men's and women's 100 metres, respectively.

On an outdoor 400 metres running track, the 100 m is run on the home straight, with the start usually being set on an extension to make it a straight-line race. Runners begin in the starting blocks and the race begins when an official fires the starter's pistol. Sprinters typically reach top speed after somewhere between 50–60 m. Their speed then slows towards the finish line.

The 10-second barrier has historically been a barometer of fast men's performances, while the best female sprinters take eleven seconds or less to complete the race. The current men's world record is 9.58 seconds, set by Jamaica's Usain Bolt in 2009, while the women's world record of 10.49 seconds set by American Florence Griffith-Joyner in 1988 remains unbroken.

The 100 m (109.361 yards) emerged from the metrication of the 100 yards (91.44 m), a now defunct distance originally contested in English-speaking countries. The event is largely held outdoors as few indoor facilities have a 100 m straight.

US athletes have won the men's Olympic 100 metres title more times than any other country, 16 out of the 28 times that it has been run. US women have also dominated the event winning 9 out of 21 times.

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