On 10 July 2008, Riccò won stage 6 of the Tour de France with a hilltop finish at Super-Besse giving him his first Tour de France stage win. There were, however, some rumors saying that test results revealed abnormalities in his blood level. The team and the athlete claimed there were no doping issues, however, since Riccò claims to have a naturally high haematocrit level. He reportedly has a UCI certificate attesting to an hematocrit of 51%, 50% being considered the accepted upper limit since 1997. Three days later he achieved his second win at stage 9 of the Tour de France with a break away climb of the Col d'Aspin.