Ben Johnson
Johnson’s name still makes Canadians sad today because his achievements were too good to be true. Canada doesn’t churn out elite athletes as often as the more-populated U.S. That’s why Johnson captured the imagination with his sprinting successes. The world champion captured gold in Seoul and he became a mainstream star.

But then he tested positive for banned substances and broke Canadian hearts. The IOC stripped him of his medal and wiped his world record from the books. Johnson attempted multiple comebacks but continuously failed drug tests. In the end, he deservedly lost the respect of his entire nation (via Sportsnet).