The West Indies took advantage of a sensational late batting collapse by Australia to beat the visitors by 18 runs in the first of five Twenty20 matches in St Lucia on Friday.
The home side scored 145 for six after being sent in to bat, with No. 6 batsman Andre Russell scoring 51 runs off 28 balls and opener Lendl Simmons adding 27.
Australia were cruising to expected victory at 70 for three when they lost six wickets for 19 runs and were all out for 127 in 16 overs. Obed McCoy took four for 26 and Hayden Walsh added three for 23 for the West Indies.
Mitch Marsh top-scored with 51 runs and took two wickets and teammate Josh Hazlewood had three for 12. Opener Matthew Wade got Australia off to a strong start with 33 runs from 14 balls, but it was wasted after the late collapse.