<p>World 400m champion Salwa Eid Naser of Bahrain was banned for two years for doping on Wednesday in a ruling by the Court of Arbitration for Sport.</p>.<p>Sport's top court upheld an appeal by World Athletics against a ruling by the federation's own disciplinary tribunal which had cleared Nigerian-born Naser of missing doping tests.</p>.<p>The ruling means she will be unable to take part in the Tokyo Olympics that begin next month.</p>.<p><strong>Read more: <a href="https://www.deccanherald.com/sports/did-a-burrito-cost-an-american-runner-her-olympic-dream-997943.html" target="_blank">Did a burrito cost an American runner her Olympic dream? </a></strong></p>.<p>Naser, 23, stunned the athletics world when she powered to the third-fastest 400m in history to take the world title in Doha in 2019.</p>.<p>Her time of 48.14sec has only been bettered by Marita Koch of the then-East Germany and the Czech Republic's Jarmila Kratochvilova in the 1980s.</p>.<p>Naser was initially charged with breaking rules governing her availability to undergo anti-doping testing and provisionally suspended in June last year.</p>.<p>But the Athletics Integrity Unit (AIU) disciplinary tribunal ruled in October that Naser had not violated anti-doping rules in relation to both missing tests and providing information relating to those tests.</p>.<p>CAS overturned that decision and ruled that the two-year ban should begin on Wednesday.</p>
<p>World 400m champion Salwa Eid Naser of Bahrain was banned for two years for doping on Wednesday in a ruling by the Court of Arbitration for Sport.</p>.<p>Sport's top court upheld an appeal by World Athletics against a ruling by the federation's own disciplinary tribunal which had cleared Nigerian-born Naser of missing doping tests.</p>.<p>The ruling means she will be unable to take part in the Tokyo Olympics that begin next month.</p>.<p><strong>Read more: <a href="https://www.deccanherald.com/sports/did-a-burrito-cost-an-american-runner-her-olympic-dream-997943.html" target="_blank">Did a burrito cost an American runner her Olympic dream? </a></strong></p>.<p>Naser, 23, stunned the athletics world when she powered to the third-fastest 400m in history to take the world title in Doha in 2019.</p>.<p>Her time of 48.14sec has only been bettered by Marita Koch of the then-East Germany and the Czech Republic's Jarmila Kratochvilova in the 1980s.</p>.<p>Naser was initially charged with breaking rules governing her availability to undergo anti-doping testing and provisionally suspended in June last year.</p>.<p>But the Athletics Integrity Unit (AIU) disciplinary tribunal ruled in October that Naser had not violated anti-doping rules in relation to both missing tests and providing information relating to those tests.</p>.<p>CAS overturned that decision and ruled that the two-year ban should begin on Wednesday.</p>