Jelena Jankovic of Serbia advanced to the quarterfinals of the Toray Pan Pacific Open on Wednesday when Russia’s Elena Vesnina was forced to retire with a left thigh injury.

Jankovic, the tournament’s seventh-seeded player, was leading 6-1, 3-0 when the match was stopped.

With the top six seeds all out of the tournament, Jankovic is the highest seeded player still in the $2 million tournament.

“I don’t really think about that,” Jankovic said. “I just think about my game and what I have to do on the court. I don’t want to put too much pressure on myself.”

Former World No. 1 Jankovic will meet France’s Marion Bartoli in the quarterfinals on Thursday.

Bartoli, seeded 14th, recovered from a set down to defeat Anastasia Pavlyuchenkova of Russia, 4-6, 6-2, 7-5.

Jankovic has lost to Bartoli twice this year, at the Australian Open and at Stanford.

Top-ranked Dinara Safina of Russia, Venus Williams and French Open champion Svetlana Kuznetsova all lost their opening matches on Monday after first-round byes.

More In: Tennis | Sport