Yulia Efimova on Sunday became the third Russian swimmer to challenge her Rio Olympics ban as the International Olympic Committee rejected blame for the Russia doping crisis.

A Russian wrestler, Viktor Lebidev, has also made an appeal against bans ordered over Russia's state-organized use of banned substances.

Efimova, who won the bronze medal in the 200-meter breaststroke at the 2012 London Olympics, follows Vladimir Morozov and Nikita Lobintsev in taking her case to the Court of Arbitration for Sport.