Ben Johnson tried to claim the title of World's Fastest Man and Olympic gold in 1988, however he failed to pass the drug test after winning the race and both honors went to Carl Lewis.
Baseball star Barry Bonds broke the home run record but he also broke the law, and after years of allegations of steroid use was finality convicted of obstruction of justice in 2011.
Figure skater Tonya Harding hired a hitman to do her cheating for her by basking in the knee of arch-rival Nancy Kerrigan.
Mike Tyson literally took a bite out of the competition when he bit a chunk out of heavy weight opponent Evander Holyfield's ear in June 1997.
The Chinese women's Olympic gymnastic team came under speculation over a number of their members being under the the mandatory age of 16.
Los Angeles Kings hockey player Marty McSorley got caught red handed in the Stanley Cup finals playing with an illegally curved stick.
Eight players of the Chicago White Sox including "Shoeless" Joe Jackson were banned from baseball for life after they plotted to deliberately lose the 1919 World Series.
Bad Sportsmanship! The Biggest Cheating Scandals In Sports