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Nadia Comaneci
Nadia Comaneci became the first gymnast in Olympic history to score a perfect 10.0 when she competed on the uneven bars at the 1976 Montreal Olympics, at just 14 years old — a score so unexpected that the scoreboard, not built to display a perfect mark, showed "1.00" instead, and it took a moment for the crowd to realize what had actually happened. She went on to score six more perfect 10s at those same Games and won three gold medals at the 1976 Olympics alone, becoming an international star almost overnight and a defining figure in Romanian sports history during the Cold War era. Comaneci added two more Olympic golds at the 1980 Moscow Games, finishing her Olympic career with five gold medals total, and her technical precision and composure under pressure at such a young age reset expectations for what age and readiness looked like in elite gymnastics. Her perfect-10 breakthrough forced the International Gymnastics Federation to eventually redesign the sport's scoring system altogether, since a scale that couldn't meaningfully differentiate between multiple "perfect" routines had clearly become outdated — a rules change directly traceable to what she did on a single night in Montreal.
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Simone Biles
Simone Biles has won more world and Olympic medals combined than any gymnast in history, a career built across the 2016, 2020 (held in 2021), and 2024 Olympics along with more than a decade of World Championship dominance, and she's widely regarded as having permanently raised the sport's technical ceiling. Biles has five skills named after her across four different apparatuses — a rule requiring a gymnast to land a new skill cleanly at a major competition before it can bear their name — a total no other gymnast, male or female, has matched, reflecting a level of difficulty she's introduced that judges and rivals alike have had to adjust to. At the 2020 Tokyo Olympics, Biles withdrew from several event finals after experiencing "the twisties," a disorienting loss of spatial awareness mid-air that made continuing dangerous, and her public explanation of the condition and prioritization of her own safety became a widely discussed moment for athlete mental health in elite sport. She returned at the 2024 Paris Olympics to win three more gold medals, a comeback that added to an already record-setting medal count and reinforced her case, already strong before Tokyo, as the most statistically dominant gymnast the sport has ever produced.
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