About Tennis ranking & position of Sania and other Indian players of present and past in that?

(1)I want to know about the various authorities that do the ranking of players in international tennis. Are there many authorities or only one? (2) Briefly I want to know how it is done. (3) Let me know about the ranking of India players in international ranking of not only players of present time but also of the past. I have asked very comprehensive information. Hope you all would try to help me out best.

SANIA MIRZA WAS RANKED AS HIGH AS NO27 BACK IN 2007. SHE’S NOW OUTSIDE OF TOP 100. AT NO 111

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