Sun says blood sample collected illegally

Olympic champ insists documents support his claim amid doping case

China's Olympic champion swimmer Sun Yang has accused a nurse involved in his doping case of not possessing the correct credentials and therefore collecting his blood sample illegally.

"She violated provincial regulations for China's nurses. Worse, she did not have a valid nursing qualification certificate, or a nursing professional certificate, and only showed me an expired certificate," Sun wrote on Weibo.