Sha'Carri Richardson has earned her Olympic redemption, winning the women's 100m final at the US track and field trials to punch her ticket to Paris, as Noah Lyles cruised through the heats on the men's side.

Reigning world champ Richardson wrested the lead midway through the race and accelerated through the final metres to finish in a world-leading 10.71 seconds, with Melissa Jefferson taking second in 10.80 and Twanisha Terry third in 10.89.

The fan favourite saw her Tokyo Olympic dream shattered with a positive cannabis test three years ago but was able to shake off the bitter memories as she took in the wild cheers from the adoring crowd in Eugene.

"I feel honoured. I feel everything, every chapter I've been through in my life prepared me for this moment," she said.

The moment was made all the sweeter for Richardson as she will travel to Paris with her training partners Jefferson and Terry. The trio embraced in a scene of utter joy after crossing the finish at Hayward Field.

"I cannot wait to go to Paris and represent," said Richardson, who went into the stands to hug her grandmother after the win. "It was a great race."

Richardson is also entered to compete in the 200m, with the opening heats for the longer sprint set for Thursday.

Lyles got a speedy start off the blocks to produce the fastest time across the opening heats in 9.92, kicking off his trials campaign with rapper Snoop Dogg sitting next to his mother in the stands.

"It was definitely the start I was looking for," he said. "I'm really proud of what I've put together."

Christian Coleman, who missed the Tokyo Games after receiving a two-year ban for breaching whereabouts rules, was the second-fastest of the day in 9.99.

The 200m Olympic silver medallist Kenny Bednarek also advanced to the semi-final stage, along with 2022 world champion Fred Kerley.

Shot put world record holder Ryan Crouser overcame multiple injuries earlier this year to win the men's final with a best throw of 22.84m, while his main rival Joe Kovacs finished second with 22.43m and Payton Otterdahl third.