Turkey's Euro 2012 qualification bid suffered a second successive setback as they lost at minnows Azerbaijan.
Guus Hiddink's side were expected to bounce back from their 3-0 defeat to Germany on Friday against the minnows, but Rashad Sadygov's 38th-minute strike condemned them to a surprise reverse.
Azerbaijan's victory meant they collected their first points of the campaign while Turkey, semi-finalists at Euro 2008, face a tough task to get out of Group A with six points from four games.
Turkey had been denied an opener by the crossbar before they fell behind, with Hamit Altintop firing against the woodwork before seeing another effort parried by Kamran Agayev.
Azerbaijan got their decisive goal just before the break following a corner routine straight from the training ground.
Selcuk Inan's low flag-kick was stepped over by two of his team-mates to allow the ball to run through to an unmarked Sadygov, who drilled a low first-time strike past Volkan Demirel.
Turkey were perhaps unlucky to be behind but they could have found themselves further in arrears with Volkan needing to deny strikes from Vuqar Nadirov and Farid Guliyev either side of the break.
Nihat Kahveci then shot over from just outside the area but Turkey should have been two down 15 minutes from the end.
Rauf Aliyev's snap shot brought a low save from Volkan but he could only push the ball into the path of Ruslan Abisov who somehow shot wide with just the goalkeeper to beat.
That miss looked like it would prove costly as Turkey pressed for an equaliser in the final 10 minutes, but they could not find a way through.
Halil Altintop spurned the best chance when Agayev spilled the ball to him but the substitute blasted his shot from six yards straight into the prone goalkeeper.