Elaine Thompson-Herah became the second-fastest woman in history as she beat fellow Jamaican Shelly-Ann Fraser-Pryce to retain her Olympic 100m title.
The 29-year-old ran 10.61 seconds, a new Olympic record and just 0.12secs short of the world record set by the US’ Florence Griffith-Joyner in 1988.
Shericka Jackson completed a Jamaican one-two-three in Tokyo with a time of 10.76, 0.02 behind Fraser-Pryce.
Great Britain’s Daryll Neita finished eighth in 11.12.
“I have been struggling with my injury back and forth,” Thompson-Herah told BBC Sport after victory.
“I see all the bad comments. I take all of my losses, all of my defeats, and I use them as my motivation.”
Neita’s GB team-mate Dina Asher-Smith failed to qualify for the final and then withdrew from the 200m after revealing she tore her hamstring earlier this month.