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The 100 metres at the World Championships in Athletics has been contested by both men and women since the inaugural edition in 1983. It is the second most prestigious 100 m title after the 100 metres at the Olympics. The competition format typically has two or three qualifying rounds leading to a final between eight athletes. Since 2011 a preliminary round has been held, where athletes who have not achieved the qualifying standard time compete to enter the first round proper. The championship records for the event are 9.58 seconds for men, set by Usain Bolt in 2009, and 10.70 seconds for women, set by Marion Jones in 1999. The men's world record has been broken or equalled at the competition three times: by Carl Lewis in 1987 and 1991, and by Usain Bolt in 2009.〔(IAAF World Championships: IAAF Statistics Handbook Daegu 2011 ), pp. 595–6 ((archived )). IAAF. Retrieved on 2015-07-06.〕 Ben Johnson ran faster than Lewis in 1987, but his record was subsequently annulled due to doping.〔Thomsen, Ian (1997-08-09). (Kipketer Glides to Victory ). ''New York Times''. Retrieved on 2015-07-06.〕 Lewis's mark, which equalled the standing record at the time, was never officially ratified by the IAAF as a world record. The women's world record has never been beaten at the championships. Carl Lewis and Maurice Greene, both of the United States, are the most successful athletes of the event, having each won three consecutive titles. Marion Jones and Shelly-Ann Fraser-Pryce are the only women to win two titles. Merlene Ottey and Carmelita Jeter are the only athletes to have claimed four medals in the history of the World Championships event. The United States is the most successful nation in the discipline, having won fifteen gold medals. Jamaica are a clear second with six gold medals. East Germany, with two, is the only other nation to have won multiple titles. ==Age== *All information from IAAF 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「100 metres at the World Championships in Athletics」の詳細全文を読む スポンサード リンク
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