Long jumper Darya Klishina has requested an emergency hearing with the Court of Arbitration for Sport after having her eligibility to compete at Rio 2016 revoked by the IAAF.
Klishina was the only Russian track and field athlete permitted to take part at the Games after a blanket ban on her compatriots over state-sponsored and organised doping programs and cover-ups.
Having spent three years based in the United States, Klishina was initially judged to be untainted by the Russian system, although she was thrown out of the competition on the second day of athletics.
But the 25-year-old, a bronze medallist at the 2014 European Championships, is determined to prove her innocence and compete as an independent athlete.
I am appealing today's decision by the IAAF Doping Review Board to the Court of Arbitration for Sport (Ad Hoc division...Posted by Darya Klishina on Saturday, 13 August 2016
She wrote on Facebook on Saturday: "I am appealing today's decision by the IAAF Doping Review Board to the Court of Arbitration for Sport (Ad Hoc division in Rio) to ban me from the Rio Olympics and other IAAF sanctioned events thereafter.
"I am seeking an emergency hearing this weekend for a decision to be made as soon as possible by the highest court in sports about my eligibility in Rio.
"I am a clean athlete and have proved that already many times and beyond any doubt. Based in the US for three years now, I have been almost exclusively tested outside of the Anti-Doping system in question.
"I am falling victim to those who created a system of manipulating our beautiful sport and is guilty of using it for political purposes.
"I will take every possible effort to protect my clean image as an athlete.
"At this moment I cannot help but feel betrayed by a system that is not focused on keeping the sport clean and supporting rank-and-file athletes, but rather seeking victories outside sport arenas."