Sha'Carri Richardson has proclaimed that she is "here to stay" after finishing last in a 100-meter sprint over the weekend.

On Saturday, August 21, the 21-year-old athlete - widely dubbed "America's fastest woman" - came in last place at the Prefontaine Classic in Oregon after being disqualified from the Tokyo Olympics when she failed a drug test.

However, despite her defeat, she remained confident in an NBC interview, asserting that she is a "sixth-fastest" woman in the world of sport and that she is "not upset at myself at all".

Check out the interview below:

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She said: "Coming out today, it was a great return - back to the sport. I wanted to be able to come and perform. Having a month off, dealing with all I was dealing with."

The track and field star went on to say: "I'm not upset at myself at all. This is one race. I'm not done. You know what I'm capable of. Count me out if you want to. Talk all the s*** you want. 'Cause I'm here to stay. I'm not done."

Richardson then declared: "I'm the sixth-fastest [woman] in this game, ever, and can't anybody ever take that away from me. Congratulations to the winners. Congratulations to the people that won, but they're not done seeing me yet - period."

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On June 28, she was given a one-month suspension after testing positive for THC - a chemical found in marijuana.

In an interview with TODAY, Richardson explained that she had taken the substance after learning from a reporter that her biological mom had suddenly died. She said in the interview that the news had been "nerve-shocking" for her.

She added: "I know what I did. I know what I'm supposed to do and what I'm allowed not to do, and I still made that decision. But I'm not making an excuse or looking for any empathy in my case.

"To put on a face, to have to go in front of the world and put on a face and hide my pain, I don't know ... Who am I to tell you how to cope when you're dealing with pain? Or you're dealing with a struggle that you've never experienced before? Or that you never thought you'd have to deal with?"

Featured image credit: Alamy / REUTERS

Sha'Carri Richardson says 'I'm here to stay' after finishing last in 100-meter sprint