Rookie Jaibir Singh of Bengaluru was a shot behind in second place while Delhi's Rashid Khan and Bengaluru's Khalin Joshi shared third place with Sri Lankan Mithun Perera at three-under-69.
Md Sanju, who finished the last PGTI season ranked 55th in the Order of Merit, was two-under through the first seven holes before he produced his two best shots of the day that led to tap-in birdies on the 10th and 11th. He did give away a bogey on the 16th but not without capitalizing on the two par-5s on the back-nine, the 14th and 17th.
"I didn't have a great season last year despite finishing inside the top-60. I also missed the cuts in the first two events of the 2017 season. So this round, my best in the last two years, is a huge morale-booster.
"The KGC course is in great condition and I've always enjoyed playing here. I had posted a top-20 last year at the bti Open. The key will be to improve on my putting from short range from here on."
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Chandigarh's Harendra Gupta, Naman Dawar of Delhi and Bengaluru's Udayan Mane were all placed tied sixth at two-under-70.
Md Zamal Hossain Mollah, Rabin Miah and Md Dulal Hossain were the highest placed Bangladeshi golfers in tied ninth with scores of one-under-71.
PGTI Order of Merit leader Ajeetesh Sandhu of Chandigarh, also the winner of the last event in Hyderabad, was in tied 17th place at even-par-72.