Sun anxious to redeem himself

Rio offers chance for superstar swimmer to shine

Chinese swimming ace Sun Yang hopes a successful defense of his titles at next month's Rio de Janeiro Olympics will finally purge the controversies that have engulfed him in recent years.

As arguably the most renowned of the 416 Chinese athletes competing in Rio, Sun has endured a rocky ride - including a detention for driving without a license, disputes with his former coach and a doping violation - since winning two gold medals at the 2012 London Games,