The 29-year-old, who had won his maiden Asian Tour event last year at the Yeangder Tournament Players Championship before clinching the Taiheiyo Club Challenge Tournament in Japan Tour, stayed three strokes adrift off leader Argentina's Emiliano Grillo, who scored seven-under 65.
With many golfers being tested by the Gary Player-designed course, the afternoon start was delayed due to the "severity of the course" and "rulings", eventually rendering the opening round incomplete.
Two-time defending champion SSP Chawrasia (74), 2015 winner Anirban Lahiri (72), and former Indian champions Jyoti Randhawa (72) and Feroz Ali (one over at 14th hole) had a tough day in office.
While Thailand's Danthai Boonma (71) rued losing four strokes in his last hole (18th) after leading in the morning to slip down the leaderboard, Argentina's Emiliano Grillo, who won the 2015 Frys.com Open in the PGA tour, rose to the top with a seven-under 65 as the day progressed.
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"As I say I had to play almost perfect golf. I putted very well. I had, I think, 26 putts and that helps anyones round out there. Hopefully I can keep rolling them in. Ive just got to keep the ball in play, thats what matters around here."
Pablo Larrazabal barely made it to the course on time after waking up 38 minutes before tee-time but yet he managed a five-under 67 to share the second spot with Adrien Saddier, Keith Horne, Paul Petersen and Matteo Manassero.
Khalin Joshi and Aman Raj too were at even-par 72 to share the 37th spot in the unfinished round.
Among others, veteran Jeev Milkha Singh went eight-over and is likely to miss the cut.
Sandhu was very precise as he fired five birdies against a bogey to return with a solid round.
"You can't overpower the course, I hit amazing today. I hit 17 greens and didn't miss a single fairway. The green that I missed was just by a foot, so it was phenomenal," said Sandhu.
Shubhankar made a fantastic recovery after three bogeys and a double bogey left him five over at the turn but the Indian blasted four birdies in the front nine to make amends.
"I didnt start the event the way I wouldve liked to. Nonetheless, Im happy with my comeback on the front-nine and the way I finished the round. My ball-striking was good through the day," Shubhankar said.
Twenty four golfers will return tomorrow to complete the opening round after they were left stranded at the cut off time.
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