Mersin İdmanyurdu (also Mersin İdman Yurdu, Mersin İY, or MİY) Sports Club; located in Mersin, east Mediterranean coast of Turkey in 2009–10. Mersin İdmanyurdu football team has finished 2008–09 season in second place in TFF Second League Promotion Group and promoted to 2009–10 TFF First League. This was the second promotion of the team and MİY became the first team that promoted to TFF First League twice. After formation of the league in 2001 (as Lig A), MİY became second team which relegated and then promoted again, after Adanaspor (the third became Çanakkale Dardanelspor after promotion play-offs in 2008–09 season. Mersin idmanyurdu participated in 2009–10 Turkish Cup and eliminated at third round, which was the play-off round for group stage. In play-off game Antalyaspor beat MİY after 11 penalties.

Ali Kahramanlı was club president. Serhat Güller was head coach at the start of the season. Ergün Penbe took over the position after 20th round. Goalkeeper Kerem İnan was the most appeared player, while Caner Ağca and Tunç Behram were top goalscorers.

2009–10 TFF First League was played as Bank Asya Birinci Lig due to sponsorship reasons. 18 teams attended. The winners and runners-up were promoted to 2010–11 Süper Lig. The third team to be promoted was determined through Promotion Group games organized as a one-leg league system. Bottom three teams were relegated to 2010–11 TFF Second League.

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