Australia held on to a narrow first-half lead to pick up a crucial victory over Tunisia that keeps alive their hopes of qualifying for the World Cup last 16.
Knowing defeat would mean an early exit from the competition, Graham Arnold’s side came out of the blocks full of energy and intent.
Mitchell Duke took advantage of their positive start when he superbly flicked Craig Goodwin’s cross into the far corner to put them 1-0 up after 23 minutes.
That sparked an outburst of jubilant celebration from the small contingent of Australia fans behind the goal, which momentarily silenced the hostile and unwavering support for Tunisia.
Hissed and jeered throughout by striking clusters of fans draped in red at the Al Janoub Stadium, Australia held their nerve to claim their first victory at a World Cup since 2010.
They survived a desperate onslaught from Tunisia in the second half, with Youssef Msakni forcing goalkeeper Mathew Ryan into a save at his near post, though that came moments after Mathew Leckie had come inches away from connecting with Goodwin’s cross at the other end.
Stoke City defender Harry Souttar put in a superb performance, making several key blocks and tackles as Australia dug in.
Australia, who suffered a humbling defeat by France in their opening match, will take on tough opponents Denmark next – but with qualification in their own hands.
Tunisia changed shape in the second half and put Australia under spells of relentless pressure. Aaron Mooy had to make another vital block, before Souttar yet again intervened to stop a dangerous counter-attack.
The anxiety was palpable in the stadium when Tunisia substitute Wahbi Khazri almost poked in a late equaliser, before six added minutes were signalled by the fourth official.
But Australia – who had to come through two play-offs to qualify for the tournament in Qatar – held on for a significant victory and they go into their final group match with all to play for.
Tunisia, who take on France in their final match, are all but out.