
9. Nadzeya Ostapchuk
Ostapchuk represented Belarus in the 2012 Olympics in London. Initially, she won the gold medal for shot-put but then the IOC stripped her. She failed a pair of drug tests and that was the end of her dream. But the worst part was that her coach played a vile role in this incident (via Sydney Morning Herald).

He dusted her food with anabolic steroids without her knowing. Ostapchuk didn’t know that there was anything wrong but she ingested banned substances. It’s a shameful thing to do because the coach ruined her reputation. He should have protected his athlete but he betrayed her in one of the worst ways possible.