Maria Sharapova
Sharapova spent 11 years as the most lucrative female athlete on the planet. The Russian star won every Major and sealed her status as one of the greatest tennis players ever. But she tarnished her legacy in 2016 when it emerged that she had failed a drug test.

This was very disappointing because of her status in the sport. It instantly generated questions about her achievements and the authenticity of her wins. Unfortunately, drug test failures create doubt but that’s something a seedy athlete lives with it (via The Guardian).