There's a bit of a history between these two. The last time Pakistan played Australia in a T20 World Cup semifinal was in 2010, and the sub-continental giants, the then defending champions, were winning it till the 39th over of the match. And then a Mike Hussey blitz happened. Three sixes and a four by 'Mr Cricket' off the miserly Saeed Ajmal in the last over dethroned Pakistan as T20 champions. It has never been the same for them after that.

from Times of India https://timesofindia.indiatimes.com/sports/cricket/icc-mens-t20-world-cup/t20-world-cup-can-australia-end-pakistans-dream-run/articleshow/87638993.cms