Sun YANG

24, China

Sport: Swimming Highest honour: 400m and 1500m gold medallist, London Olympics, 2012. Ban: 2014, three months. Drug used: Trimetazidine. 2016 events: 400m, 800m, 1500m. Synopsis: China’s first male Olympic swimming gold medallist has been troubled since the London Games. A Porsche he was driving without a licence collided with a bus in November 2013, he tested positive in May 2014 and was accused by a Brazilian coach of kicking and elbowing one of their female competitors at last year’s world championships. Sun subsequently opted out of defending his 1500m title.