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Usain Bolt powered to 200m gold to become the first man to successfully defend both Olympic sprint titles. Bolt, who retained his 100m crown on Sunday, led home a Jamaica one-two-three in a time of 19.32 seconds to win a fifth Olympic gold medal. Yohan Blake took silver in 19.44, with Warren Weir in third. Bolt, 25, will attempt to win his sixth Olympic gold as part of the Jamaica 4x100m relay team, with the heats beginning on Friday.