Elaine Thompson-Herah completed a second successive Olympic sprint double yesterday when she won the 200m gold in 21.53 seconds, the second-fastest time in history behind US legend Florence Griffith Joyner's 21.34 set in 1988.

The Jamaican, 29, 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 21.81sec at the Tokyo Olympic Stadium.