City mate Syed Saqib Ahmed who is just back from winning the Sri Lankan Open Amateur shot a 3-under 69 to be placed second along with Ainesh Ahluwalia.
Aman Raj with a total of 2-under 70 was in fourth position.
As many as three players - Simarjeet Singh, IL Aalaap and Manu Gandas were tied for the fifth position at 71 while Gagandeep Sidhu and Vikram Rana shared the eighth spot at 72.
Udayan who began from the 10th was in the thick of things making two birdies in the first four holes.
Adding another birdie on the 17th, he was three-under for the day.
However he committed a mistake on the 18th and ended up with a bogey to take the turn at 2-under.
The bubbly youngster began strongly on his back nine making a birdie on the opening hole.
Playing some superb golf, Udayan kept away from the dirt and finished in a great fashion making three birdies in his last four holes to be back in the club house as the leader.
"The weather was brilliant with the winds staying unusually quiet for most part of my round," said Udayan after the round.
"I was driving and hitting it well that actually overshadowed my short game. I am happy to end-up as the leader and hope to sustain my form," added the leader.
Top scores (after 18 holes)
66 Udayan Mane; 69 Syed Saqib Ahmed, Ainesh Ahluwalia; 70 Aman Raj; 71 Simarjeet Singh, IL Aalaap, Manu Gandas; 72 Gagandeep S Sidhu, Vikram Rana; 73 Karan Taunk, Ankur Chadha
--IBNS (Posted on 27-08-2013)