World Aquatics has successfully defended its policy restricting transgender athletes from women’s elite competitions, dealing a final blow to Lia Thomas’ Olympic aspirations.

The international swimming federation implemented rules in 2022 prohibiting athletes who went through male puberty from competing against biological females, citing competitive fairness and physiological advantages.

Thomas, who transitioned after swimming three years on Penn’s men’s team, challenged the policy after dominating women’s collegiate competitions.

The legal defeat means the swimmer cannot participate in June’s Olympic trials, where organizers plan to hold events in the innovative setting of Lucas Oil Stadium’s football field.

While the ruling maintains traditional categories for female swimmers, it leaves open questions about future participation pathways. World Aquatics’ “open” category, designed specifically for transgender athletes, has yet to gain traction. The decision represents a significant moment in global sports, potentially influencing how other organizations handle similar cases involving transgender competitors.