| Venue: Hayward Field, Eugene, Oregon Dates: 15-24 July |
| Coverage: Watch live on BBC TV, BBC iPlayer, BBC Sport website and mobile app (UK only) |
Felix won a bronze medal in the 4x400m mixed relay at the World Championship, her last medal.
Felix was denied a golden farewell by the Dominican Republic.
13 of Felix's 19 world medals are gold.
The 1500m semi-finals took place in Oregon on the first day of the season.
She finished second in her heat in four minutes 7.53 seconds, while Snowden was tenth in her heat in four minutes 6.92 seconds.
"You want to think about the final but you have to get there first, it's always a bit nerve-racking," he said.
The strength in depth is great at this level.
I wanted to stay out of trouble and save as much energy as I could.
That felt comfortable.
The final is on Monday.
The World Championships, the biggest track and field event to be held in the United States since the Atlanta Olympics of 1996, will be Felix's final event in athletics.
The US took the early lead in the final with the home crowd in Eugene cheering as Felix took the baton.
They fell into third on the anchor leg as Kennedy Simon of the Dominican Republic was chased down by Femke Bol of the Netherlands.
Michael Johnson is a four-time Olympic champion and former US sprinter.
The longevity of her career has been the most impressive.
She has made five Olympic teams, eight World Championship teams, and that's unheard of.
The British quartet finished fourth at the World Championships in 2019.
Holly Bradshaw was forced to pull out of the pole vault after her pole snapped during the warm-up.
The 30-year-old was forced to miss the indoor season because of various health, body and mental challenges.
Bradshaw had a pole snap for the first time in her career and said it was frightening.
She said she hopes she doesn't break her wrist because that's a long time out.
I can't tell you how many things have gone wrong, but this is the icing on the cake. I'm close to laughing it off.
Scott Lincoln missed out on a place in the men's shot put final despite reaching the final of the men's hammer throw.
Zharnel Hughes finished second in his heat with the fifth fastest overall time, but fourth in his heat was not enough to get him into the final.
Fred Kerley was the fastest man in the world with a time of 9.94 seconds.
Africa's fastest man, Ferdinand Omanyala, who only arrived in Eugene about three hours before his heat, made it through to the semi-finals.
Permission to enter the United States was granted to the Kenyan on Thursday, and he flew out of the country the next day.
Chris Thompson won't run the marathon because of the delays in processing his visa.
According to the organizers, less than 1% of athletes in need of a visa had been denied the paperwork to enter the United States.
It was the first gold medal of the Championships and the first medal of any colour at an athletics World Championship, and it was won by a woman fromPeru.
I have wanted this medal for a long time. She said she wanted to dedicate it to everyone in the country.
Japan's Toshikazu Yamanishi defended his title.
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