Los Angeles: Sania Mirza and her American partner Bethanie Mattek bowed out of the WTA East West Bank Classic after retiring midway through their semi-final here. Mattek had a back injury.

Second seeds Sania and Mattek were trailing 2-6, 1-2 when they pulled out of their match against the Czech pair of Eva Hrdinova and Vladimira Uhlirova . (PTI)