Fenerbahce on Sunday evening snapped a three-match losing streak by beating Atiker Konyaspor 1-0 in an away match.
Fenerbahce's Eljif Elmas scored the only goal in the 67th minute, giving his team an important win.
Fenerbahce will play against Besiktas next week in the league for a derby showdown.
Galatasaray handed Kasimpasa its first loss of the season Friday with a 4-1 victory at home as the two teams switched positions at the top of the Turkish Spor Toto Super Lig.
Galatasaray now has 12 points, leading the league table by goal average.
The other Istanbul heavyweight Besiktas defeated Yeni Malatyaspor 2-1 on Saturday evening at Vodafone Arena in Istanbul to bag three points.
In the other matches of the fifth week, Ankaragucu edged out Akhisarspor 1-0, Goztepe defeated Kayserispor 2-0, DG Sivasspor drew BSB Erzurum 2-2, M. Basaksehir defeated Antalyaspor 4-0, C. Rizespor drew Bursaspor 1-1.
At the last match of the fifth week, Aytemiz Alanyaspor will play against Trabzonspor on Monday.
Here are the latest standings: