Saina, who advanced to the women's singles quarterfinal at the ongoing World Championships in Guangzhou, was overtaken by Thailand's Ratchanok Intanon.
Saina's compatriot P V Sindhu managed to retain her 12th position in the world rankings.
In the men's singles rankings, Parupalli Kashyap slipped four places to the 17th spot while R M V Gurusaidutt jumped a spot to a career-best 20th position. Ajay Jayaram, who crashed out in the second round of the World Championships, was static at 24th position.
Among other men's singles players, Sourabh Verma, B Sai Praneeth, K Srikanth, Anand Pawar are ranked between 36th to 39th positions while H S Prannoy has jumped five places to the 46th spot.
However, no Indian features in the top-25 of the doubles rankings in any category.


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