Mohammad Amir announced his retirement from Test cricket to concentrate on the limited-overs game, ten years after a spot-fixing ban halted his burgeoning career.
Pakistan's slender chances of advancing to semi-finals alive as batsman Haris Sohail smashes rapid-fire 89 in a comfortable 49-run win at Lord's.
Australia, batting first, were dismissed for 307 in 49 overs and Pakistan were bowled out for 266 in 45.4 overs.
Opener Chris Gayle, set to retire at the end of the tournament, led the West Indies reply with a blistering 50 off 34 balls as the two-times champions chased down Pakistani total, reaching 108-3 with 36.2 overs to spare.
The 18-run victory gave Pakistan a come-from-behind 2-1 series win that will see them overtake New Zealand at the top of the world rankings.
Pakistan overcame a familiar attack of batting nerves to beat Sri Lanka by three wickets in a see-saw Group B game.
Climbing to the top of the ICC Test rankings has been a long and arduous journey, but the real challenge for Pakistan is to remain at the pinnacle of test cricket.
Pakistan foiled a gutsy England run chase to win a gripping first test by 75 runs at Lord's on Sunday.
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