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A doping case involving a Russian curler at the Pyeongchang Olympics would be "extremely disappointing" if proved true, the International Olympic Committee said Monday. "It's extremely disappointing for us if a case is proven," IOC spokesman Mark Adams said after a curler from the Olympic Athletes from Russia (OAR) delegation was implicated in the second doping scandal to hit the Games. A spokesman for the OAR in Pyeongchang told Russian media that an A sample showed a possible violation of anti-doping rules and a B sample would be tested later Monday.