The 23-year-old Indian registered a 21-11 17-21 21-13 win over Bae in a match that last for one hour. It was Saina's sixth victory over Bae, who had an upper hand against the Indian recently in French Super Series and World Champioship.
World number six Saina had suffered back-to-back defeats at the hands of Minatsu Mitani of Japan and world number one Chinese shuttler Li Xuerui in her two matches of Group B, which had put her in a must-win situation today to salvage any hope of a semifinal qualification.
Later in the day, Xuerui packed off Mitani 21-11 21-14 to make it a three-way tie among Saina, Bae and Mitani for the second place in the group.
However, according to the tournament rules, when the difference of games won and games lost was calculated, Bae was found ahead of Saina and Mitani and the Korean joined Xuerui as the runners-up from Group B.
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After lying low for the last two days, Saina came out with all cylinders blazing against Bae. She moved well across the court and played an aggressive game.
Saina then engaged her rival in an aggressive rally and finished it with a good net play. The left-handed Bae found it difficult to negotiate Saina's better net play and allowed the Indian to take a 18-10 lead.
A couple of points more and Saina was sitting comfortably on a 10 game points but the Indian rushed into a net shot as Bae saved one game point but the Hyderabadi didn't make any more mistake and nosed ahead when the Korean hit wide.