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The 12th IAAF World Championships in Athletics (German: 12. IAAF Leichtathletik WM Berlin 2009) were held in Berlin, Germany from 15–23 August 2009. The majority of events took place in the Olympiastadion, while the marathon and racewalking events started and finished at the Brandenburg Gate.

Usain St. Leo Bolt, OJ, CD (pron.: /ˈjuːseɪn/; born 21 August 1986), is a Jamaican sprinter widely regarded as the fastest person ever. He is the first man to hold both the 100 metres and 200 metres world records since fully automatic time measurements became mandatory in 1977. Along with his teammates, he also set the world record in the 4×100 metres relay. He is the reigning Olympic champion in these three events, the first man to win six Olympic gold medals in sprinting, and a five-time World champion. He was the first to achieve a "double double" by winning 100 m and 200 m titles at consecutive Olympics (2008 and 2012), and topped this through the first "double triple" (including 4×100m relays).