Besiktas' Super Lig title hopes suffered a setback with a 3-1 home defeat to close challenger Kasimpasa.
The home side found itself trailing to a
Third-placed Besiktas remains four points behind leader Galatasaray, while it is now just three points better off than Kasimpasa.
Genclerbirligi climbed into the top six with a late 2-1 victory over Karabukspor.
A ninth-minute opener from
The dismissal of Anil Karaer seven minutes into the second half came as a blow to Karabukspor but it held on until the final minute, when
Istanbul Buyuksehir pulled three points clear of the drop zone with a 4-2 win over bottom club Mersin Idmanyurdu, which remains eight points from safety.
Turkish Super Lig
Cenk Tosun's first-half double helped Gaziantepspor to an upset 3-2 win over fifth-placed Trabzonspor.