Shericka Jackson became the fifth fastest woman of all time as she won the 100m in 10.65 seconds at Jamaica’s national championships.
It was the fastest time in the world this year - beating the 10.71secs run by Sha’Carri Richardson at the US championships the previous day.
And Jackson, tied with American Marion Jones for fifth on the all-time list, says she can still improve.
“I think the ending needs a little fixing,” said the 28-year-old.
“I know I’m a strong finisher, but I still need to work on that a bit.
“I have to go back to the drawing board with coach, but tonight I did a very good job.”
It means Jackson, 200m champion and 100m silver medallist at last year’s World Championships in Oregon, will be heading to the World Championships in Budapest in August.
She will be joined by Shashalee Forbes and Natasha Morrison who came second and third respectively, while Shelly-Ann Fraser-Pryce also qualifies as defending world champion.
Two-time Olympic champion Elaine Thompson-Herah, however, will not feature after coming fifth following an injury-affected season.
The men’s event was won by Jackson’s training partner Rohan Watson, 21. (BBC sport)