While the 21-year-old Saina was stunned by Germany's Juliane Schenk in the last-four stage in Japan, she could not advance beyond the quarterfinals of the World Badminton Championship and China Masters.
Commonwealth Games bronze medallist P Kashyap and Ajay Jayaram, who had a decent quarterfinal finish at the world championship, also surged one place ahead in the ranking to be placed 22nd and 24th respectively.
Jwala Gutta and V Diju, who reached the semi-finals of China Masters, zoomed six places to 29th place, while Jwala abd Ashini Ponnappa were in 16th position, improving two places in the latest ranking.
Saina regains number four spot in world ranking
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