Galatasaray have defeated rivals Besiktas 2-0 in a Turkish league derby at Turk Telekom Arena in Istanbul on Sunday.Home team Galatasaray started strong with Turkish winger Yasin Oztekin finding the net in the 11th minute. Galatasaray made it 2-0 in the 80th minute of the game as Dutch playmaker Wesley Sneijder smashed the ball outside the area for the goal. Leaders Galatasaray now have 76 points. Fenerbahce follow with 70 and Besiktas come in third with 66 points.As a result, Besiktas will not be able to play in the Champions League next season.If Fenerbahce lose or draw against Istanbul Basaksehir in an away match Monday, Galatasaray will clinch the title with a match to spare.Before kick-off, Galatasaray fans in the stadium performed a choreography symbolizing the club's possible 20th domestic league title.Results:Genclerbirligi 1-2 Mersin IdmanyurduKasimpasa 3-3 SAI Kayseri ErciyessporTorku Konyaspor 1-1 Caykur RizesporTrabzonspor 3-2 BalikesirsporGaziantepspor 3-2 EskisehirsporKardemir Karabukspor 2-1 Medicana SivassporGalatasaray 2-0 BesiktasMonday's fixtures in the league:Istanbul Basaksehir vs Fenerbahce at 8 p.m. (1700GMT)Akhisar Belediyespor vs Bursaspor at 8 p.m. (1700GMT)