Three second round losses in recent past and one week's lay-off from competition pushed Sania Mirza nine places down to 45th in the latest WTA singles rankings.
With 489.75 points to her credit, Sania was the biggest loser among the top 50 players in the circuit.
Eight lower-ranked players moved ahead of her this week in the rankings headed by Kim Clijsters of Belgium, according to information received in New Delhi.
The 19-year-old Hyderabadi, however, maintained her previous week's 64th spot in doubles ranking.
Meanwhile, all other Indian women moved down the ladder except US-based Shikha Uberoi who jumped 11 places to move up to 149th, with Ankita Bhambri (363th), Rushmi Chakravarthi (373rd), Sanaa Bhambri (470th) and Shruti Dhawan (512th) failing to raise their rankings.
WTA rankings:
1. Kim Clijsters (Bel); 2. Amelie Mauresmo (Fra); 3. Justine Henin-Hardenne (Bel); 4. Lindsay Davenport (USDA); 5. Maria Sharapova (Rus); 6. Mary Pierce (Fra); 7. Nadia Petrova (Rus); 8. Elena Dementieva (Rus)