Doubles delight

Date-Krumm, meanwhile, earned a place in the semifinals of the women's doubles on Wednesday -- the first time she has done so in her long career.

The Japanese veteran, who reached a quarterfinal in 1992, made the breakthrough in partnership with Czech Barbora Zahlavova -- 15 years her junior -- as they beat eighth seeds Andrea Hlavackova of the Czech Republic and Zheng Jie of China.

They will next take on Makarova and her fellow Russian Elena Vesnina, the fourth seeds who knocked out the Williams sisters in their quarterfinal on Tuesday.

"I cannot believe it myself," Date-Krumm said. "Recovery is difficult at my age, but I'm enjoying every moment with Barbora."

The other semifinal will feature former world No. 1 Martina Hingis, who with Pennetta will be seeking the ninth women's doubles title of her career -- but the first since 2002.

They will take on third-seeded Cara Black of Zimbabwe and Sania Mirza of India.