World champion Allyson Felix stayed on course for a rare Olympic double with a solid qualifying run in the 400 metres semi-finals at the US Olympic track and field trials.
Still pained by an April ankle sprain, America's most decorated female sprinter eased into Sunday's final with the second fastest time of the day on Saturday, running 50.31 seconds.
Although definitely not at top shape, the 30-year-old hopes to make the US team in both the 200m and 400m and go for an Olympic double only achieved by two women.
The 200m Olympic champion, Felix will need a top-three finish in both races at the cutthroat trials to qualify for Rio.
"It's difficult to not feel like me," Felix said.
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"I'm having to go with what I have and change a little bit."
Felix, who injured her right ankle weightlifting, appeared stronger than in Friday's first round.
Prior to this weekend, she had run only two 400m races and no 200s this year.
The 200 metres, which starts on Friday, is still on her schedule.
Only Francena McCorory had a faster time in the 400 semi-finals, clocking 50.28 seconds.
While young Travyon Bromell overshadowed US mainstays Justin Gatlin and Tyson Gay in the men's 100m qualifying, Olympic long jump gold medallist Brittney Reese created some major fireworks.
Trailing world champion Tianna Bartoletta, Reese exploded to the longest jump in 12 years, a lifetime best 7.31 metres.
Only Jackie Joyner-Kersee (7.49m) has jumped further among American women.
Bartoletta, working in a 100m heat between jumps, finished second with a wind-assisted 7.02 metres with Janay DeLoach (6.93m) also making the US team.
