Skipper Prithvi Shaw led from the front with a 94-run knock and shared a 180-run stand with fellow opener Manjot Kalra (86) to power India to a challenging 328 for seven.
There was no respite for the Australians even after their departure with Shubhman Gill tormenting the bowlers with his 63-run knock.
India pacers Kamlesh Nagrakoti (3/29) and Shivam Mavi (3/45) then impressed with their speed and shared six wickets between them to shot out Australia for 228 in 42.5 overs.
Australia opener Jack Edwards top-scored for his side with a 73-run knock after a steady start with Max Bryant (29) but struggled to find support from others.
Jonathan Merlo (38) tried his best in the middle order and stumper Baxtor Holt (39) resisted in a rearguard fight but both were undone by Mavi.
India next play Papua New Guinea on Tuesday.
"I think it was a good start for us and a positive one for us in the tournament," said skipper Shaw.
The splendid top-order batting vindicated Shaw's decision to bat in their tournament-opener.
It was not that Shaw and Klara plundered boundaries, instead they raised their knocks with some stupendous risk- free batting.
Shaw, though, missed out on a century by six runs as he was caught behind off Will Sutherland, son of Cricket Australia CEO James Sutherland.
The Indian captain faced 100 balls and scored eight boundaries, including two sixes in his knock.
There were no steady partnerships after their departure even as Gill kept one end solid with his 54-ball knock which had six fours and a six.
The middle order batsmen lost their wickets, trying to accelerate the run-rate as Himanshu Rana (14) and Anukul Roy (6) fell cheaply.
Abhishek Sharma though managed to come up with a 8-ball 23-run cameo which propelled India past the 300-run mark. He hit two sixes and as many fours.
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