Doping hearing clouds Sinner credentials for tennis greatness / Pogba: I considered retiring before doping reprieve / Niroshan Dickwella suspended for doping violation / UK swimming legend Peaty laments 'lack of transparency' amid China doping row / Adam Peaty speaks out on swimming doping scandal as China win dominant gold / Olympic swimmers speak out about Chinese doping; and Britain's Adam Peaty says they should be out / Former Wales scrum-half Rhys Webb given four-year ban for doping positive / Paul Pogba handed four-year ban for doping / France and Juventus midfielder Paul Pogba banned for four years for doping / Dwain Chambers keen to advise British athletes on dangers of doping