Md Zamal Hossain Mollah of Bangladesh is two strokes off the lead in second place.
The scoring conditions were tough as the day witnessed light rain accompanied by a gentle breeze. As a result it turned out to be a high-scoring day.
Shankar produced six birdies against a lone bogey in his opening round of 67.
The three-time winner on the PGTI started his tournament with a birdie on the 10th, his first hole of the day. He fired his approach shot from 145 yards within a foot of the hole on the 10th. The 30-year-old Shankar then sank a seven-footer for birdie on the 16th. His lone bogey came on the 17th where he three-putted.
Shankar went on to pick up two more birdies on the fifth and ninth after landing his approach shots within six feet on both occasions.