Trailing Atwal by one stroke are Gursimar Badwal, Vani Kapoor, Ankita Tiwana and Saaniya Sharma -- who are tied for the second spot at level par -- after the first round.
The event will culminate on July 10.
Mehar, who won the event here last year as an amateur, started off confidently and was on par score till the sixth hole. She dropped her first shot on the 7th hole but recovered soon by carding her first birdie on the last shot of the front nine. In the back nine, the defending champion did not get the start she would have liked, and dropped a shot on 11th hole.
Gursimar, who could have easily played an under par round, carded five birdies on the 4th, 11th, 13th, 17th, and 18th holes, a record for the day that she shared with Vani Kapoor. However an equal number of bogies on the 2nd, 5th, 7th, 8th and 12th holes undid the good work, and she had to be content with an even par score.
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Hero Order of Merit leader Vani Kapoor carded five birdies, but dropped three shots along with a double bogey to record a level par score. Birdies on the 2nd, 4th, 8th, 10th and 11th holes were cancelled out by bogies on the 3rd, 13th and 16th holes, along with a double bogey on the 6th hole.
Saaniya was the fourth golfer to finish the first round on level par.
Rani Sonti and Neha Tripathi ended the first round with a score of two over 74.
Amandeep Drall and Priya Puri were at tied 8th position with identical scores of three over 75.
Veteran Smriti Mehra, could not deliver on the expected lines and ended the first round with a score of six over 78.
The amateurs in the fray did not perform up to expectation. While Diksha and Trisha returned with a card of four over 76 to finish on tied 10th position along with Shweta Galande, Millie Saroha and Suchitra Ramesh ended the day at tied 15th position. Astha Madan and Raksha Phadke are at 17th and 18th positions, respectively.