SCR rallied from a goal down to put it across Mumbai Super League champions Indian Navy 3-1 in Pool A, while Army XI outclassed MHAL President's XI by an identical margin in Pool B.
The Navy took the lead off a penalty corner goal by Jugraj Singh before the southern railmen came into their own.
They equalised through P R Aiyappa in the first half before completing their tally by adding two more goals through Raju Pal, a superb reverse hit solo goal, and Aiyappa, who scored his second goal in the dying moments.
Taking some time to settle down, the fitter armymen took 1-0 lead when Binay Bhengra took control of a cross from the right to slot in.
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Crossing over with a 1-0 lead, Army XI increased the lead when T B Sudhakar slid the ball in from close range off a minus pass from the right byline.
MHAL missed a good chance to make it 2-1 as Mayur Patil fluffed a 'stroke' award.
MHAL had to wait till the fag end to open their account in the 68th minute when Manpreet Singh scored with a reverse hit.