It's still unclear if Russian swimmer Yulia Efimova will be allowed to compete in the Olympics.
The International Olympic Committee's rule to keep the Russian breaststroker out of the pool because of an earlier doping suspension has been declared "unenforceable."
However, the Court of Arbitration for Sport declined Thursday to be responsible for the final decision, rejecting Efimova's appeal to force swimming's governing body and the IOC to accept her competing in Rio de Janeiro.
Efimova would be one of Russia's best hopes to win gold medals in the 100- and 200-meter breaststrokes if she were to compete. The eight-day swimming competition begins Saturday.
She bounced back from a doping ban to win the 100 breast at last year's world championships in Kazan, Russia. Efimova missed four months this season after testing positive for the banned substance meldonium but was given a reprieve and won the 200 at her comeback meet in Los Angeles last month.