Harry Souttar's 89th minute own-goal handed Bahrain a memorable victory over Australia, emerging 1-0 victors at the Cbus Super Stadium.
The visitors were handed the advantage late on after Kusini Yengi's straight red card, with Souttar turning home Mahdi Al Humaidan's cross after a spell of pressure.
Australia were restricted to few opportunities in the first half, with Craig Goodwin and Yengi going close in quick succession just before the interval.
Despite registering 69.3% of possession in the opening half, the hosts managed just five shots at Ebrahim Lutfallah's net, only one of which was on target.
Graham Arnold's side struggled to penetrate Bahrain's stern defensive shape, with their task made even more difficult when Yengi was given his marching orders for a high foot on Sayed Baqer.
And there would be a further twist in the tale as Al Humaidan drove to the byline before delivering into the area, with the outstretched knee of Souttar diverting it past Mat Ryan for Bahrain's first goal against the Socceroos in 18 years.
It marked a nightmare start for Australia in the third round of the 2026 AFC World Cup qualifiers, with both Japan and Saudi Arabia to come.
Data Debrief: Socceroos fail to jump into gear
Australia can only blame themselves for their defeat on home soil, generating an expected goals (xG) total of 0.79 from the 11 shots they registered in the encounter.
They also managed 20 touches in the opposition's penalty area, compared to Bahrain's four, while also ending the contest with 71% possession.
Bahrain, meanwhile, will count their lucky stars having only managed an xG of 0.07, managing just one shot on target from the three they attempted.