Andy Murray launched an attack on the handling of the Operation Puerto case in Spain and questioned whether the “biggest cover-up in sports history” had taken place.
A Spanish court convicted Dr Eufemiano Fuentes of endangering public health for running a sports doping ring that provided blood transfusions to cyclists.
Fuentes was given a one-year suspended sentence and banned from practicing medicine for four years, while handing him a €4650 fine.
However, the British number one’s ire was drawn by the court when Judge Julia Patricia Santamaria ordered the destruction of 211 bags of blood and plasma found in police raids of his offices in 2006.
It was hoped that the samples would help identify other sports stars that had been using Fuentes’ expertise to improve performance illegally.
“Operacion Puerto case is beyond a joke," Murray said through his Twitter account.
"Biggest cover up in sports history? Why would court order blood bags to be destroyed? #coverup.”
Spanish anti-doping authorities and the World Anti-Doping Agency (WADA) are expected to appeal the court’s decision.
Murray has consistently called for greater testing in tennis and so his stance on the court’s decision is understandable.