United SC looked all set to dominate with goals from Eric Brown (13th) and Waheed (22nd) in the first quarter.
But debutant Durga Boro (30th) pulled one back after being set up by the Brazilian forward who also scored a 55th minute equaliser to earn 2-2 draw and shatter United's hopes.
The North East side have 21 points from 16 matches, compared to United's 20 from 17 as the script for the United SC folded much like in their last match when Mumbai FC had scored a stoppage time equaliser.
The hosts continued to dominate proceedings with Lajong only carrying out one attack during the first 20 minutes with Boithang Haokip finding the net.
The local challengers doubled their advantage when Waheed capitalised on a mistake in the Lajong defence and slotted past Vinay.
But the lead got reduced at the half-hour mark thanks to some individual brilliance from Uilliams.