Ben Johnson: His 1988 gold medal was given to rival Carl Lewis after Canada's record breaking 100-meter sprinter tested positive for steroids.
Bobby Unser: The renowned race car driver won the Indianapolis 500 on May 24 but five months later (October), officials named Mario Andretti the winner after Unser was penalized for passing during a yellow flag.
Dancer's Image: The horse won the 1968 Kentucky Derby but a lab report revealed he took Phenylbutazone and stripped him of the title and prize money.
Danny Almonte: Weeks after the Bronx team finished third at the Little League World Series, it was discovered Almonte was actually 14 years old, not 12.
Rosie Ruiz: She won the 1980 Boston Marathon, but it was later discovered she had run only about a mile of the 26.2-mile course.
Chinese gymnastics: The team had to give back its bronze medal after it was discovered Dong Fangxiao was two years short of the minimum age of 16.