Alexandr Kolobnev

In 2012, the Union Cycliste Internationale initiated an investigation of Kolobnev and the Kazakh rider Alexander Vinokourov over allegations brought by the Swiss news magazine L'lllustre and Italian newspaper Corriere della Sera. They accused Vinokourov of cutting a deal with Kolobnev in 2010 to aid Vinokourov in winning Liège–Bastogne–Liège, alleging €150,000 exchanged hands. On 12 September 2019, prosecutors requested a six-month jail sentence for Kolobnev and Vinokourov, with an additional fine of €50,000 for Kolobnev, as well as €150,000 to be confiscated from his bank account. Kolobnev and Vinokourov were cleared on 5 November 2019, with the judge citing a "lack of concrete evidence" for the court's decision.

In the 2011 Tour de France he tested positive for the diuretic hydrochlorothiazide, a masking agent that can hide the presence of performance-enhancing drugs. He was subsequently pulled from the tour by his team, and his results for that stage were annulled. Despite his B sample also testing positive he only received a fine from the Russian cycling federation. However this was later appealed by the UCI to CAS, although he was subsequently cleared of any charges on 29 February 2012. Kolobnev rejoined Team Katusha in March 2012.

In 2007 he transferred to Team CSC. He won the third stage of Paris–Nice, became the inaugural winner of the Monte Paschi Eroica, now known as Strade Bianche, and finished second at the UCI Road World Championships. Kolobnev finished fourth in the road race at the 2008 Olympic Games. Second-place finisher Davide Rebellin later tested positive for Continuous erythropoietin receptor activator (CERA), causing the IOC to strip him of his silver medal. Though the UCI considers Kolobnev promoted to third in the race's standings, he has not been awarded a bronze medal.

Born in Vyksa, Russian SFSR, Kolobnev spent his neo-pro year in 2002 with Acqua e Sapone–Cantina Tollo. His second season saw him sign with Domina Vacanze–Elitron. There, he took his first victory in Stage 2 of the Settimana Internazionale di Coppi e Bartali. He stayed with Domina Vacanze through the 2004 season and signed with UCI ProTeam Rabobank for 2005. With Rabobank he managed to capture Stage 1 of the Volta a la Comunitat Valenciana in 2006.

Alexandr Vasilievich Kolobnev (Russian: Александр Васильевич Колобнев ; born 4 May 1981) is a Russian former professional road bicycle racer. His major victories include winning the 2007 Monte Paschi Eroica, a stage of the 2007 Paris–Nice and he is a two-time winner of the Russian National Road Race Championships. In 2011, he was provisionally suspended after testing positive for a potential drug masking agent. He was cleared of intentional doping by the Court of Arbitration for Sport in February 2012, and returned to Team Katusha in March 2012.