New York, Sep 3 (IANS): Indian tennis player Sania Mirza moved into the women's doubles semi-finals of the US Open with Zimbabwe partner Cara Black after rivals Zarina Diyas and Yi-Fan Xu retired in the quarters.

Third seeds Sania and Cara took the first set 6-1 in 40 minutes and won a game in the second set when Kazakh Zarina and her Chinese partner Yi-Fan retired at the Flushing Meadows here Tuesday.

Sania and Cara will now face Martina Hingis of Switzerland and Flavia Pennetta of Italy in the semi-final.

The Swiss-Italian pair registered a 6-4, 6-3 win over fifth seeds Kveta Peschke of Czech Republic and Katarina Srebotnik of Slovakia.

Sania has now equalled her best performance here. She had also reached the semis last year with Chinese partner Zheng Jie.

In the mixed doubles semi-final, top seeded Sania and her Brazilian partner Bruno Soares will face Yung-Jan Chan of Chinese Taipei and Ross Hutchins of Britain Wednesday.

Meanwhile, in the junior boys' singles second round, South Korean seventh seed Duckhee Lee eased past India's Sumit Nagal 6-2, 6-2.