Date Krumm, two decades older than the 19-year-old Russian, appeared to be the younger player as she saved all six break points she faced and jumped all over the serve of Pavlyuchenkova, a two-time tour winner this year at a career-high 20th ranking.

The result lifted the Japanese veteran into her first quarterfinals since January, and only her third since her remarkable victory here a year ago, where she became the second oldest winner on tour after Billie Jean King in 1983.

Next up for Date Krumm, who turns 40 on Tuesday, will be eighth-seeded Agnes Szavay of Hungary, another two-time winner on tour this year.

Top-seeded Nadia Petrova beat Vania King of the United States 6-3, 6-4, and remained on course for an all-Russian semifinal with former No. 1 Dinara Safina.

Safina, a wild-card entry, topped fellow Russian, third-seeded Maria Kirilenko 6-2, 6-3 for the first time in three match-ups this year.

Safina struggled through the first half of the year with a back injury. She's lined up in the last eight against Klara Zakopalova of the Czech Republic, who beat Safina in Madrid in May.

No. 5-seeded Alisa Kleybanova of Russia also advanced, but No. 4 Maria Jose Martinez Sanchez of Spain and No. 6 Yaroslava Shvedova of Kazakhstan fell in straight sets.

In Tashkent, top-seeded Alexandra Dulgheru and second-seeded Akgul Amanmuradova were upset in the quarterfinals of the Tashkent Open on Thursday.

Fifth-seeded Monica Niculescu beat Dulgheru 7-6 (5), 2-6, 6-3 in an all-Romanian match, while local favorite Amanmuradova, a two-time runner-up, was ousted by seventh-seeded Alla Kudryavtseva of Russia 7-6 (5), 6-3.

In Friday's semifinals, Niculescu will face fourth-seeded Elena Vesnina of Russia, who eliminated Darya Kustova of Belarus 6-0, 6-1. Kudryavtseva will play fellow Russian Evgeniya Rodina.

Kudryavtseva is coming off a runner-up finish in Guangzhou, China on Sunday.

Rodina reached her first career semifinals with a 6-4, 4-6, 6-0 win over Stefanie Voegele of Switzerland.

In Tokyo, tournament organizers say top-ranked Serena Williams has pulled out of the Pan Pacific Open, two months after surgery on her right foot.

Williams, who cut her foot on broken glass at a restaurant after winning Wimbledon, returned to practice earlier this month.

Williams was to head a strong field for the Sept. 26-Oct. 2 event, which includes defending champion Maria Sharapova. Others in the field include Wimbledon runner-up Vera Zvonareva, French Open champion Francesca Schiavone, Caroline Wozniacki and Jelena Jankovic.

After missing the US Open, Williams said she wasn't sure when she'd return to competition. She added she plans to play for the United States in the Fed Cup final against Italy in November.