You are right, Adana Demirspor also beat Beşiktaş. They are a strong team that could be a problem for Fenerbahçe. They were eliminated by penalties in the European cups and almost skipped the round. They have a nice and experienced staff. They have the power to beat any team. They also pose a danger for Galatasaray. They became one of the best Anatolian teams this year. It will be a difficult away game for Fenerbahçe.
Now Adana Demirspor is in third position and has great potential to become tough competitor for Fenerbahce and Galatasaray it seems that the strength of Adana Demirspor cannot be underestimated by the top teams.
Maybe in the future they will be team that can win the Turkish Super League title if they can continue to develop every season and of course try to compete to beat the top teams.
In the next three matches Adana Demirspor still has chance to win but in the fourth match they have to face Fenerbahce but in this match they have home advantage so they can optimize their game to at least give satisfactory result.