Austria rose from the dead in the fourth quarter to stun hosts Luxembourg in Group B.
Trailing 57-40 after Martin Rajniak's basket for Luxembourg at the end of the third, the Austrians looked destined for defeat but they outscored their hosts 24-5 over the last 10 minutes and won 64-62.
Luxembourg extended their lead to 18 (60-42) three minutes into the final quarter after Tom Schumacher made one of two from the stripe.
That is when the wheels came off for the home team.
The visitors reeled off 22 straight points and clinched the win.
Bernd Volcic split a pair of free throws with 2:57 remaining to tie the contest at 60-60, and after an Alvin Jones turnover, Thomas Schreiner's lay-up put the Austrians in front for good.
Fouled by Jean-Marc Melchior, Schreiner failed to convert the three-point play but Rajniak turned the ball over and Schreiner stretched the lead to four with a lay-up.
Jones ended the drought which had lasted nearly five and a half minutes when making a lay-up to cut the deficit to 64-62.
Austria then left the door open for a Luxembourg win.
David Jandl missed with a jumper, and after Davor Lamesic grabbed the offensive rebound, Jandl missed again.
Rajniak was also off target with a jumper, and Austria held on.
Schumacher had 19 points for Luxembourg, and Volcic scored the same amount to lead Austria.