Australia's Davis Cup Finals prospects are all but shot following John Millman's shock loss to world No.282 Zsombor Piros.
Piros' 4-6 6-4 6-3 victory earned Hungary a 1-0 lead over Australia in Saturday's crucial Group D tie in Turin.
After a crushing 3-0 loss to Croatia in their opening tie, Australia must beat Hungary to have any hope of scraping into the quarter-finals.
Realistically, though, Lleyton Hewitt's team likely needed a big 3-0 win to clinch a place in the last eight as one of the best two Group runners-up.
That's not possible now after Millman suffered a defeat even more surprising than Alexei Popyrin's loss to world No.276 Borna Gojo.
It was only Popyrin's second Davis Cup appearance and he was found wanting against a player ranked some 215 places behind him on the ATP computer.
Popyrin admitted afterwards he felt it was "probably the most painful loss" of his career, prompting Hewitt to replace the 22-year-old Cup rookie with the vastly experienced Millman.
But Millman, too, disappointed with everything on the line for Australia.
Hewitt entered Saturday's tussle believing it was "mathematically possible" for his team to make the quarter-finals.
But their hopes are fast evaporating.
Australian No.1 Alex de Minaur, currently ranked 34th, will play world No.40 Marton Fucsovics in the second singles rubber.
Hewitt has named Alex Bolt to partner John Peers in the doubles, after using de Minaur against Croatia.
Australia hasn't won the Davis Cup since 2003.