Russia's second most powerful track official stepped down Friday amid a doping case, while seven other athletes are accused of training in secret with a banned coach. The cases come as Russia tries to have its ban from international track competitions, in place since 2015, lifted in time for the world championships in September and October.

Caster Semenya has won another court decision in her battle to get track and field's testosterone regulations thrown out. The Olympic 800-metre champion's lawyers say the IAAF, the governing body of athletics, has failed with an urgent request to Switzerland's supreme court to have the testosterone rules immediately re-imposed on Semenya.

The IAAF has denied promising that Russia will be reinstated in time for the track and field world championships, after Russian state TV quoted the country's top track official as saying he'd received guarantees.