In classification group, team finished at top and attended to promotion play-off games but eliminated at first round (quarter finals).

[4] Mersin İdmanyurdu (MİY) 1998–99 Second League season first half game reports in Ranking Group 1 is shown in the following table.

However, because points and goals were carried from ranking group, in aggregate MİY finished first and became eligible to play promotion play-offs.

[7] Mersin İdmanyurdu (MİY) 1998–99 Second League season first half game reports in Classification Group 1 is shown in the following table.

In quarter finals Mersin İdmanyurdu was eliminated by Çaykur Rizespor who finished Promotion Group at fifth place.

[9] Game details: 1998–99 Turkish Cup was played by 90 teams in 6 rounds prior to quarterfinals.

[Mersin İdmanyurdu] had participated in 37th Turkish Cup (played as Türkiye Kupası in 1998–99) at Round 2 and eliminated.

[10] The drawings and results Mersin İdmanyurdu (MİY) followed in 1998–99 Turkish Cup are shown in the following table.

Mersin İdmanyurdu (MİY) 1998–99 Turkish Cup game reports is shown in the following table.

Municipality official Mehmet Küver was president of the club at the start of the season.