Saina continued her march towards the season's first title with a 21-5 21-10 victory over Russia's Perminova.
In a mixed doubles match, the Malaysian pair of Khalid and Soong defeated the Indian pair of Sanyal and Jwala.
Saina went down fighting 21-16 10-21 19-21 to a lower-ranked Yao Xue of China.
Saina, surprisingly, could not catch her opponent even once during game two.
This is the Guntur lad's second-biggest career-win after he'd scalped Jan O Jorgensen last season.
His victory in the national junior championship last month made way for his top ranking.