Sania Mirza was leading 6-1, 2-0 when Alexandra Stevenson retired with a right shoulder strain.
The Indian tennis ace will meet Olga Shevchuk of Ukraine in the first round.
Top seed Kim Clijsters edged past Jelena Jankovic, while Maria Sharapova beat fellow Russian Vera Zvonareva at the Acura Classic.
Sania Mirza, seeded ninth, advanced with a 6-1, 0-6, 6-1 victory over Finland's Emma Laine.
The Indian girl and Alisa Kleybanova defeated Emma Laine of Finland and Nadja Pavic of Crotia 6-1, 6-2 in the quarters.