He finished fourth at the 2004 Summer Olympics, and in 2005 he won the World Championships after his countryman Ivan Tsikhan was stripped of his gold medal because of doping violations.

He originally won a silver medal at the 2008 Summer Olympics, but was later taken away for doping, but reinstated afterwards.

[7] In June 2010 CAS ruled that the Beijing National Laboratory, which carried out the tests, had violated "documentation and reporting requirements" and granted his appeal for the reinstatement of the original competition results and the metal to be returned.

CAS said the lab had provided no "plausible explanation" for interruption of the automated testing procedure of the IRMS—isotope ratio mass spectrometry—instruments and the lab breached international standards by having the same analyst test both the "A" and "B" samples.

CAS further elaborated that the departure from these international standards "justify the annulment of the tests' results for both athletes".