A new and unique hybrid cultivar of garden phlox named Phlox ‘;Opening Act Pink-a-Dot’; multi-stemmed, medium upright height, slowly-spreading habit with clean, medium-green, glossy, lanceolate leaves with exceptional powdery mildew resistance. Foliage is thick and leathery on stiff stems. Flowers are near white with deep pink eye resembling a star, produced on branched peduncles and nearly cover the top of the plant beginning early summer, about two weeks prior typical Phlox paniculata cultivars and continuing for about five weeks. ‘;Opening Act Pink-a-Dot’; is especially suitable as a potted plant, for the garden, for attracting hummingbirds and butterflies, and for cut flower arrangements.