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Shelly-Ann Fraser-Pryce of Jamaica became the first woman to retain the 100 meters Olympic sprint title on Saturday.
Fraser-Pryce won in 10.75 seconds, a fraction outside her personal best, with Carmelita Jeter of the United States taking silver in 10.78.
Jamaica took the bronze too, with Veronica Campbell-Brown clocking 10.81 seconds.
It was one of the fastest finals in history, with the top six runners posting sub-11 second times.