Fred Kerley led an American triple in the 100 meters when he won the gold in 9.86.
But in the double distance he was not successful.
It was an exit already in the semifinals after a race of 20.68, which gave a sixth place in the heat far from advancement.
- I had cramps, it's part of the game.
It is not something that affects the rest of the season, I feel good, he said according to Reuters afterwards.
All the better it went for 18-year-old sensation Erriyon Knighton who won her heat at 19.77.
There is much to suggest that the final will be an American settlement between him and reigning champion Noah Lyles, who had the best time in the semifinals of 19.62.
- I'm exactly where I want to be.
My trainer told me to release some of the wildlife today, he said.