Swimming at the 2008 Summer Olympics – Men's 100 metre freestyle
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The Men's 100 metre freestyle event at the 2008 Olympic Games
2008 Summer Olympics
The 2008 Summer Olympics, officially known as the Games of the XXIX Olympiad, was a major international multi-sport event that took place in Beijing, China, from August 8 to August 24, 2008. A total of 11,028 athletes from 204 National Olympic Committees competed in 28 sports and 302 events...

 took place between August 12 and 14 at the Beijing National Aquatics Center. This swimming
Swimming (sport)
Swimming is a sport governed by the Fédération Internationale de Natation .-History: Competitive swimming in Europe began around 1800 BCE, mostly in the form of the freestyle. In 1873 Steve Bowyer introduced the trudgen to Western swimming competitions, after copying the front crawl used by Native...

 event used freestyle swimming
Freestyle swimming
Freestyle is an unregulated swimming style used in swimming competitions according to the rules of FINA. The front crawl stroke is almost universally used during a freestyle race, as this style is generally the fastest...

, which means that the method of the stroke is not regulated (unlike backstroke, breaststroke, and butterfly events). Nearly all swimmers use the front crawl
Front crawl
The front crawl, forward crawl, or freestyle is a swimming stroke usually regarded as the fastest of the four front primary strokes. As such, the front crawl stroke is nearly universally used during a freestyle swimming competition, hence the synonymously used term "freestyle". It is one of two...

or a variant of that stroke. Because an Olympic size swimming pool is 50 metres long, this race consisted of two lengths of the pool.

Nine heats were held, with most containing the maximum number of swimmers (eight). The heat in which a swimmer competed did not formally matter for advancement, as the swimmers with the top sixteen times from the entire field qualified for the semifinals. Two semifinal heats of eight swimmers each were held. The swimmers with the eight fastest times again advanced to the finals; there, they all competed in a single final heat to earn final placements.

The qualifying norms were for the 2008 event were 49.23 seconds (A norm) and 50.95 seconds (B norm). NOCs with two or more swimmers meeting the A standard could enter any two such swimmers; otherwise, they could enter a single swimmer meeting the B standard.
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