Mersin İdmanyurdu (also Mersin İdman Yurdu, Mersin İY, or MİY) Sports Club; located in Mersin, east Mediterranean coast of Turkey in 1998–99. Mersin İdmanyurdu (MİY) participated in 1998–99 Second League season for the 25th time. MİY couldn't attend promotion group but had finished classification in the first place and attended promotion play-offs, but couldn't promote. Team also participated in Turkish Cup in 1998–99 and eliminated at Round 2.

Mehmet Küver was club president. Müjdat Yalman managed the team in the first half. In the second half Kahraman Karataş was head coach. Oğuzhan Doğar appeared in all league games. In total Gökhan Sakar share the most appearance with 32 appearances. Gökhan Sakar was also league and season top goalscorer.

Mersin İdmanyurdu took place in Group 1 in 1998–99 Second League season. League was played in three stages. In the first stage 50 teams in five groups (10 clubs in each) played for first two rankings to play in promotion group. The promotion group consisted of those 10 teams. At the end of the second stage top two teams promoted to 1999–00 First League. Remaining 8 teams in each ranking group played in classification groups, by carrying points and goals from ranking groups. Bottom two teams relegated to 1999–00 Third League at the end of the season. In the third stage, 8 clubs (3 from the promotion group and 1 each from 5 classification groups) played one-leg play-off games in Antalya Atatürk Stadium to determine the third team to be promoted to First League.

Mersin İdmanyurdu took place in Group 1 consisted of 10 teams and finished first stage at third place and couldn't took place in promotion group. In classification group, team finished at top and attended to promotion play-off games but eliminated at first round (quarter finals).

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