Sania Mirza and South African partner Liezel Huber crashed out of the doubles competition at the WTA Acura Classic after losing to German Anna-Lena Groenefeld and USA's Meghann Shaughnessy in the quarterfinal.

Sania and Liezel, seeded eighth at the event, went down in straight sets 6-2, 7-5 against the fourth seeded German-American pair.

Groenefeld and Shaughnessy will now face top seeds American Lisa Raymond and Samantha Stosur of Australia for a place in the final of the San Diego hardcourt tournament.

The victors, who had a bye in the first round and had an easy second round victory, kept up their form to wrap up the first set in convincing fashion.

However, Sania and Huber gave their more fancied opponents a tough run in the second set before faltering at the end.