Angeline Gervacio came through with 12 points, including the match-point kill to give the Lady Eagles their fourth win against no losses.
Ateneo trailed early in the third set, 10-14, before it made the necessary adjustments on both ends to slowly chip away the deficit.
A running spike by guest player Suzanne Roces put the Lady Eagles ahead, 21-17.
Alyssa Valdez added 10 points, nine of which were power spikes.
Royce Quijano led the Lady Stingers with 13 markers.
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