Beşiktaş suffered a shock home defeat at the hands of Akhisar losing their first game in 10 league games.
Güray Vural gave Akhisar an early lead and Sami doubled the lead five minutes before half time thanks to a goalkeeping error from Tolga Zengin.
The Black Eagles are still first in the Turkish Super League but Fenerbahçe could overtake their Istanbul rivals with a win against Trabzonspor tomorrow.
Beşiktaş 0 – 2 Akhisar Belediyespor
Stadium: Başakşehir Fatih Terim
Referee: Barış Şimşek, Serdar Diyadin, Esat Sancaktar
Beşiktaş: Tolga Zengin, Beck, Rhodolfo, Tosic, İsmail Köybaşı, Hutchinson, Oğuzhan Özyakup, Quaresma, Sosa (min. 64 Gökhan Töre), Olcay Şahan (min. 46 Cenk Tosun), Gomez (min. 86 Kerim Frei)
Akhisar Belediyespor: Lukac, Ahmet Cebe, Douglao, Caner Osmanpaşa, Kadir Keleş, Merter Yüce, Sami (min. 81 Bruno), Nguemo, Custodio (min. 57 Aykut Çeviker), Güray Vural (min. 63 Onur Ayık), Rodallega
Goals: min. 4 Güray Vural, min. 40 Sami (Akhisar Belediyespor)
Yellow Cards: min. 41 Olcay Şahan, min. 65 Oğuzhan Özyakup, min. 74 Cenk Tosun, min. 90 Quaresma (Beşiktaş), min. 41 Güray Vural, min. 54 Douglao, min. 58 Ahmet Cebe (Akhisar Belediyespor)