(Adds Brailsford quotes) By Julien Pretot VALENCE, France, July 19 (Reuters) - Top cycling performances should not systematically trigger doping suspicions, Tour de France overall leader Chris Froome said on Sunday. The Team Sky rider, whose impressive ride up La Pierre St Martin in the first mountain stage raised suspicions like his 2013 ride up the gruelling Mont Ventoux, had urine thrown at him by a spectator during Saturday's 14th stage. There were no incidents on Sunday, however, with Froome even speaking of a "fantastic atmosphere" on the road of the 183-km ride from Mende to Valence. More...