Also, didn't PKB post about a lady who actually won some titles or did much better at slams in the 50s?
Rita Davar made the Wimbledon junior singles final in 1952 (losing a 3-setter). She also qualified into the main draw of singles twice, and made R3 of Mixed Doubles once.
I think that only highlights Sania's achievement even more starkly. Apart from Rita Davar, the only other Indian women to have played Slam singles at all are Nirupama Vaidyanathan (once), Shikha Uberoi (once) and NRI Laxmi Poruri (3-4 times). Sunitha Rao reached the final round of qualifying at 4 Slams. For Sania to have been in the top-30 in a sport where no other Indian woman has ever been ranked in the top-120 (the highest being NRI Shikha's rank of 122) is truly extraordinary. Plus she has six Slam titles (MxD and women's doubles). We easily downplay doubles in tennis because we have had so much success -- but where are the doubles greats from India in badminton or table-tennis?