evidence: Transgender swimmer Lia Thomas loses CAS case to overturn World Aquatics ban Lia Thomas, the transgender swimmer who was barred from competing in women's events, has lost her case against World Aquatics at the Court of Arbitration for Sport (CAS). [...] "World Aquatics welcomes the recent decision made by the Court of Arbitration for Sport (CAS) regarding the case of Lia Thomas, which we believe is a major step forward in our efforts to protect women's sport," World Aquatics said in a statement.