Recently, Maria Sharapova, a five-time Grand Slam champion, received a two-year ban from the sport of tennis by the International Tennis Association. The Russian tennis pro tested positive for Meldonium, which can enhance endurance. Sharapova admitted that she took the drug for several years, but claims that she wasn’t aware that it had been added to the list of banned substances. While this is shocking to her fans, she isn’t the only athlete to get caught up in a doping scandal. Here are some others who came before her.