CAS tribunal upholds lifetime ban on Russian doping doctor

ZURICH, March 13 (Reuters) - The Court of Arbitration for Sport (CAS) on Monday upheld a lifetime ban levied against Sergei Portugalov, former chief of the Russian Athletics Federation's Medical Commission, for his role in providing illicit substances to Russian athletes. Lausanne-based CAS upheld the ban as part of an arbitration involving the International Association of Athletics Federation (IAAF) and the Russian Athletics Federation, citing in a statement "clear evidence" that he violated IAAF doping rules governing possession and trafficking of prohibited substances. In a 2015 report, the World Anti-Doping Agency (WADA) wrote that Portugalov supplied performance enhancing drugs to athletes and coaches, administered doping programmes and "even injected athletes himself". (Reporting by John Miller; Editing by Michael Shields)