Australia 2 for 226 (Healy 148*) beat Sri Lanka 7 for 94 (Carey 3-15) by 132 runs
Alyssa Healy produced a batting masterclass at North Sydney Oval to set a new world record with the highest score in women's T20Is with an unbeaten 148 off 61 balls.
Healy's century came off 46 deliveries, the second-fastest in women's T20Is, as she plundered 19 fours and seven sixes to carry Australia to 2 for 226 - equaling their highest total in T20Is. The eventual margin of victory was 132 runs to complete the 3-0 scoreline.
She struck the ball magnificently all around the wicket, but her straight driving - both along the ground and in the air - was the standout featured and it was fitting that a straight six took her to the new individual record, surpassing Meg Lanning's 133 made earlier this year against England in a penultimate over that cost 28. This time Lanning was at the non-striker's end to admire the innings.
Healy, whose batting has gone to a new level over the last two years, celebrated her 100th T20I two days ago and had looked in supreme form in the first two matches of the series without converting rapid starts but this time took the chance to fill her boots.
She survived two half chances early in her innings when she was missed at deep cover in the second over and then from a tough leg-side stumping in the fourth, but dominated throughout the innings.
There was an opening stand of 59 with Beth Mooney and then a 109-run partnership for the second wicket alongside Rachael Haynes, also given a life on 2 from another missed stump, who was the latest batter to be given a chance at No. 3 in this series.
Really, though, Healy's team-mates were mere spectators to the destruction that unfolded.
The only member of the Sri Lanka team who hasn't looked out-classed in this series has been captain Chamari Atapattu. She escaped the carnage with the ball as she claimed 2 for 27 from her four overs then provided resistance, if not aggression, with the bat.
Having lit up the opening match of the series with 113 she made 31 off 39 balls, before being bowled by Nicola Carey, to take her series tally to 160. Lanning again used plenty of bowling options with seven players given the ball with Carey, who took 1 for 9 off her four overs in the previous match, make the most of her opportunity by nabbing 3 for 15 amid a late flurry of wickets.
Harshitha Madavi, who was tipped by Atapattu to have a bright future, stuck in to make 28 which against such a good attack will only benefit her.
The tour now moves into ODI mode with three matches in Brisbane with Australia's next T20Is being a tri-series involving England and India at the end of January ahead of the T20 World Cup.