The Süper Lig is a Turkish professional league for association football clubs. It is the top-flight of the Turkish football league system. It is one of the top leagues in the UEFA confederation, and the winner of the competition automatically qualifies for the UEFA Champions League group stage. Eighteen clubs compete annually, where a champion is decided and three clubs are promoted and relegated from, and to, the 1. Lig. The season runs from August to May, with each club playing 34 matches. Matches are played Friday through Monday. It is sponsored by Spor Toto and therefore officially known as the Spor Toto Süper Lig. The competition formed as the Milli Lig in 1958. It was the first national league competition held in Turkey. Previously, league competitions took place in a few cities, including Adana, Ankara, Eski?ehir, Istanbul, Izmir, Kayseri, and Trabzon. It is currently ranked 11th in the UEFA coefficients of leagues based on performances in European competitions over the last five years.