Still NISA is at the top of the current league table at 47 points while SSU is two points behind at third.
TRUGPU Nambol is trailing the Thangmeiband side by a single point.
At Khuman Lampak Main Stadium today, SSU beat NISA by a solitary goal.
The all important goal was scored by Y Sachnanda capitalising on a through pass by L Dewan in the 16th minute.
Even as NISA was awarded a penalty kick just 14 minutes later, goalkeeper Narakanta of SSU denied the possible equaliser by blocking the kick from S Manimohon.
Today's result was exact reverse of the first leg match in which the Thangmeiband side overcame SSU at the same goal margin.
Earlier in the day, MPSC outlasted NEROCA 3-2 .
N Deshkumar, Ksh Kanta and Md Ziaul Haque scored for the police side.
For NEROCA, Tongbram Raju and H Chakravarti scored one apiece.
MPSC won the first leg match too. At Khuman Lampak pratice field, NLYC Churachandpur held ESU Wangkhei to a 1-1 draw.
Ph Cheitei's 58th minute goal was neutralised by Thangminlien of NLYC in the 76th minute.
ESU beat NLYC 2-1 in the first leg.
TRAU Kwakeithel overcame YWC Thambalkhong 5-4 in a high scoring match played at the same ground.
Helun Haokip struck thrice as David Kamson and P Ajitkumar contrubuted one goal each.
For YWC, L Sunil scored twice in addition to one each by Palmei Paupangai and W Daniel.
But in the first leg, YWC blanked TRAU 2-0 .
At Bishnupur Mini Stadium, TRUGPU Nambol defeated USA Khurai 2-1, thanks to an own goal by Ch Kesho.
The first goal was scored by G Anthony Kabui.
N Sushil struck the lone goal for USA.
The first leg match between the two teams ended in goalless draw.
At Kodompokpi ground, PYC Phoudel beat AMOFA Moirang 2-1 whom they whipped 3-1 in the first leg.
L Bikram and Md Shahidur Rehman scored for the winners.
The lone goal for the Moirang side was a suicide goal made Kh Binoy.