Jelena Jankovic of Serbia returns a shot during her first round women's singles match against Laura Robson of Britain in the 2010 Wimbledon Championships, in London, Britain, June 21, 2010. Jankovic won 2-0. [Xinhua/Zeng Yi]

Top-seeded Jelena Jankovic of?c was forced out of the Slovenia Open as she injured her ankle in the second round.

Jankovic was leading at 6-1, 2-1 against Belarus qualifier Anastasiya Yakimova then stepped awkwardly when chasing a ball on the baseline and twisted her ankle.

She continued to play but lost the second set 6-3 and retired at the beginning of the third set.

It was her first tournament since Wimbledon, where she retired in the fourth round with a back injury.

In her third career WTA quarterfinals and first this year, Yakimova will next face Ksenia Pervak, who beat qualifier Alexandra Panova 6-2, 7-5 in an all-Russian match.

Pervak jumped into the draw to replace French Open champion Francesca Schiavone, who was to be second-seeded but withdrew due to a wrist injury.

Third-seeded Anastasia Pavlyuchenkova of Russia beat Rossana De Los Rios of Paraguay 6-3, 6-0 to face Johanna Larsson of Sweden, who reached her first WTA quarterfinals by defeating Maria Elena Camerin of Italy 7-5, 6-1.