Five-time Olympic gold medalist Nadia Comaneci made history at the 1976 Montreal Summer Olympics by becoming the first gymnast to earn a perfect score of 10 at the Olympic Games.
The then-14-year-old Romanian's achievement was so rare at the time that the scoreboards in Montreal displayed 1.00, unable to program the perfect 10.0 score.
United States gymnast Mary Lou Retton also recorded perfection, earning 10s on the floor exercise and the vault at the 1984 Los Angeles Olympics.
The International Gymnastics Federation changed its 10-based scoring system in 2006, eliminating the possibility of a perfect 10. Here's a look at the highest-scoring Olympic gymnastics routines since the scoring change.
Men's floor exercise
Shirai Kenzo (Japan): 16.133 at the 2016 Rio Olympics
Women's floor exercise
Simone Biles (United States): 15.966 at the 2016 Rio Olympics
Men's vault
Marian Dragulescu (Romania): 16.800 at the 2008 Beijing Olympics
Women's vault
McKayla Maroney (United States): 16.233 at the 2012 London Olympics
Uneven bars
Nastia Liukin (United States): 16.900 at the 2008 Beijing Olympics
Balance beam
Shawn Johnson (United States): 16.225 at the 2008 Beijing Olympics
High bar
Epke Zonderland (Netherlands): 16.533 at the 2012 London Olympics
Parallel bars
Huang Xu (China): 16.475 at the 2008 Beijing Olympics
Still rings
Chen Yibing (China): 16.650 at the 2008 Beijing Olympics 2008
Pommel horse
Xiao Qin (China): 16.100 at the 2008 Beijing Olympics
Check out the ESPN Olympics hub page for the latest news, previews, roster updates and more.