Following Vaishavi are Kiran Matharu (70) and Neha Tripathi (72), who are placed second and third respectively.
Vaishavi started impressively, carding two birdies on the second and eighth holes in her front nine. She sustained the momentum in the latter half as well, adding two more birdies on the 15th and 17th holes.
Indian origin English golfer Kiran picked three birdies on the fourth, seventh and 18th holes against a bogey on the 17th hole.
Hero Order of Merit leader Vani Kapoor carded one-over 73 to take the fourth spot, while Hero MotoCorp sponsored Bengaluru golfer Sharmila Nicollet and Kapurthala's Gursimar Badwal are tied fifth, with identical scores of two-over 74.
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Sharmila had an indifferent day as she carded three bogies on the second, eighth and ninth holes with a lone birdie on the fourth hole in her front nine.
She played with much more control in the latter half, carding one more birdie on the 15th hole while dropping one shot on the 12th hole.