Hakan Sukur got the ball rolling for the visitors after 36 minutes with Arda Turan and Umit Karan then scoring in the space of two minutes to give the Istanbul club a 3-0 lead at the interval.
Serkan Calik rounded off the goals two minutes from time to move Galatasaray to the summit ahead of Fenerbahce, who were just as impressive in their 4-1 win over former league leaders Sivasspor.
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