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Having been asked to bat first, Australia lost skipper Aaron Finch early, who failed to read the wrong-un from Wanindu Hasaranga and was out bowled.
After the wicket of Finch, debutant Jos Inglis and McDermott and Inglis took the attack to the bowlers and completed their 50 run partnership before the latter was dismissed in the 11th over by Karunaratne.
Marcus Stoinis made 30 of 17 balls and was the only batsman apart from McDermott who looked comfortable in front of the Sri Lankan bowlers.
The first wicket came when Danushka Gunathilaka tried to attack Hazlewood but ended up handing a catch straight into the hands of Stoinis at mid-wicket.
Zampa struck with another wicket in the same over and dismissed Asalanka, exposing the inexperience of the Sri Lankan batting lineup.
Dinesh Chandimal was the only saving grace towards the end for Sri Lanka with 25 off 16, but was not enough to get Sri Lanka through as they fell short by 20 runs .