Stars aim to make positive splash

American great Ryan Lochte will join other stars in trying to give swimming a positive spin at this week's world short-course championships, following an uncomfortable few weeks for the sport.

Last week it emerged that in May double Olympic and five-time world champion Sun Yang failed a test for banned substances, which revealed the stimulant trimetazidine. He was slapped with a three-month ban.

There was also news of another Russian doping violation, months after sports minister Vitaly Mutko admitted the country was "on the brink" of being suspended from competition as positive tests continued to mount.