Martina Navratilova’s Fight to Protect Women’s Sports: Why the Debate Over Sex-Based Competition Continues
Tennis legend Martina Navratilova has become one of the most prominent former athletes to argue that women’s sports should preserve a meaningful distinction between male and female competition.
For Navratilova, the issue is not primarily about personal identity. Instead, she has consistently framed it as a question of competitive fairness: whether athletes who experienced male puberty should be eligible to compete in female sporting categories, particularly at elite levels where small physiological differences can determine the outcome of a match, race or championship.
Her position has placed her at the center of one of the most contentious debates in modern sport. Supporters of sex-based categories argue that women’s competitions were created because biological differences between males and females can produce significant advantages in strength, power, speed and endurance. Critics, meanwhile, argue that restrictive eligibility rules can exclude transgender athletes and create unnecessary scrutiny of women whose biological development does not fit conventional expectations.
The debate has become increasingly important as international sports organizations have adopted new policies concerning eligibility for women’s competition. In 2026, the International Olympic Committee announced a new policy limiting eligibility for female-category events at the Olympic Games to biological females, while World Athletics has maintained eligibility rules that distinguish participation according to biological sex characteristics.
Against this changing backdrop, Navratilova’s arguments have gained renewed attention.
Martina Navratilova’s Position on Women’s Sports
Navratilova is not simply an outside commentator on the subject. She spent decades competing at the highest level of professional tennis and became one of the most successful players in the history of the sport.
Her perspective is therefore heavily influenced by her experience competing in a women’s category where physical differences can have enormous consequences. Tennis requires a combination of speed, explosive power, endurance, coordination and reaction time. A difference that might appear relatively small in everyday life can become decisive when two elite athletes are separated by only a few points.
Navratilova has argued that women's sport requires a protected competitive category precisely because male and female athletic development are not identical.
Her argument centers on biological sex rather than gender identity. In her view, recognizing someone’s gender identity and ensuring that person is treated with dignity are separate questions from determining eligibility for a specific sporting category.
That distinction is important because the modern debate is often presented as though there are only two possible positions: supporting transgender people or supporting women’s sports. In reality, the policy question is more specific.
It asks what criteria should determine access to a category that exists because of physiological differences.
That question has no simple answer across every sport.
Why Puberty Matters in the Sporting Debate
One of the most important concepts in the debate is puberty.
During male puberty, rising levels of testosterone contribute to changes in body composition, skeletal development, muscle mass, cardiovascular capacity and other physical characteristics. These changes can influence athletic performance long after puberty itself has ended.
This is one reason several international sports organizations have focused their policies not simply on an athlete’s gender identity, but on whether an athlete has experienced male puberty.
World Athletics, for example, introduced rules in 2023 excluding transgender women who had undergone male puberty from female World Ranking competitions.
The organization subsequently revised its framework. Its current regulations include biological eligibility requirements for athletes seeking to compete in the female category, with a one-time SRY gene test incorporated into the rules that came into effect in September 2025.
The reasoning behind policies such as these is that some physical characteristics associated with male puberty may not disappear completely after testosterone suppression.
That is the core physiological argument frequently cited by people who support sex-based sporting categories.
However, the scientific discussion is more complicated than simply saying that every advantage is permanent or that hormone therapy has no effect.
Hormone therapy can change body composition and reduce certain performance-related characteristics. The precise magnitude and persistence of these changes can vary depending on factors including age, the timing of transition, the sport involved and the physiological characteristic being measured.
Consequently, an accurate discussion should distinguish between the existence of physiological differences, the effects of puberty, the effects of hormone treatment and the degree to which those differences remain relevant to a particular sport.
Why Biological Differences Can Matter in Elite Sport
Elite sport is built around extremely narrow margins.
A recreational athlete can lose a fraction of a second, several centimeters or a small amount of strength without the result having much practical significance. At the highest level, however, those differences can determine medals, rankings, sponsorships and professional opportunities.