The Yellow Canaries threw away the chance of overtaking Galatasaray's spot in the league by displaying perhaps their worst performance of the season.
Genclerbirligi took the lead in the 32nd minute through a great long shot by Petkovic, only for Fenerbahce to equalize through a Mehmet Topal header in the 72nd minute.
Minutes only before the final whistle Genclerbirligi's Mostapha el-Kabir put his team back in the lead after a huge mistake by Fenerbahce's veteran goalie Volkan Demirel.
More bad news might come to Fener as in-form defender Egemen Korkmaz was taken out in the 43rd minute due to injury and he might miss next week's crucial match against title rivals Besiktas.
After failing to capitalize on Galatasaray's 2-2 draw with Basaksehir, Fenerbahce sit third in the league with 50 points, two points behind Galatasaray and four points behind new league leaders Besiktas. Full league table can be found here.
