'Any time someone has looked like superwoman they have been guilty of doping'

Ye Shiwen's Olympic 400m individual medley time was more than seven seconds faster than her time in the same event at last year's World Championships.

John Leonard, the American director of the World Swimming Coaches Association, said the swimmer's performance was "suspicious".

He told the Guardian newspaper:

The one thing I will say is that history in our sport will tell you that every time we see something, and I will put quotation marks around this, 'unbelievable', history shows us that it turns out later on there was doping involved.

He added:

Any time someone has looked like superwoman in the history of our sport they have later been found guilty of doping.