Track coach Alberto Salazar received no relief from the Court of Arbitration for Sport. The court upheld Salazar’s four-year ban for a series of doping-related violations that had long been pursued by American regulators. CAS confirmed the ruling in Switzerland on Thursday. Salazar is a former marathon champion who trained a long list of championship distance runners including Mo Farah, Galen Rupp and, for a time, Kara Goucher. None of his former runners have been charged with doping violations. The U.S. Anti-Doping Agency investigated Salazar and the running team for about six years before handing down sanctions.