Olympic great Allyson Felix could make her 10th and final World Athletics Championships appearance later this month after being named in the United States 4x400m mixed relay pool.
Felix, the most decorated female track and field Olympian of all time, will retire at the end of the season.
The 36-year-old has won 19 world medals in her career, including 14 gold.
She failed to qualify for the individual 400m event after finishing sixth in the US trials.