TOKYO (Reuters) - Elaine Thompson-Herah completed a second successive Olympic sprint double on Tuesday when she won 200 metres gold in a blistering 21.53, the second-fastest time in history.

The Jamaican controlled the race from the start and was a clear winner, but 18-year-old Christine Mboma of Namibia produced an astonishing final 30 metres to make up four places and take silver in 21.81.