Australia now need to score at only 2.8 runs an over to get to 139 and with it annexe the only trophy missing from its collection.
Chris Gayle top scored with 37, while Shivnaraine Chanderpaul with 27 and Dwayne Bravo with 21 were the only other batsmen to get into double figures.
Bracken with 2-22 and McGrath with 2-24 were the pick of the bowlers.
West Indies today brought in Corry Collymore for Dwayne Smith, while the Aussies included left arm spinner Brad Hogg in place of seamer Mitchell Johnson.
UNI GS ADG DH BS1751