Kayseri Erciyesspor
On 17 September 1967, during a match against Kayseri Erciyesspor (Then Kayserispor) played at the Kayseri Atatürk Stadium, a disaster occurred with 40 dead and at least 300 injuries among the fans, which was the worst sporting-related event in Turkey. Almost all casualties were Sivasspor fans, who perished in a stampede after chaos broke out in their ranks, due to attacking Kayserispor fans. The match was finished 1–0 in favour of the Kayseri side. After the disaster, Kayseri Erciyesspor and Sivasspor played different groups of the 2nd league until the 1990–91 season. That year, both teams reconciled and played in the Fourth Group of the Third League (now TFF Second League). Kayseri Erciyesspor were champions and promoted to Second League.