Team's bad performance continued in Cup matches as well.

Trainers Seyfi Alanya and Turgut Kafkas managed the team for the rest of the first half games.

Mersin İY finished 16th with 3 wins and relegated to second division next year.

Mersin İdmanyurdu participated in 1977–78 Turkish Cup and eliminated at round 3 by Sivasspor.

[34] The drawings and results Mersin İdmanyurdu (MİY) followed in 1977–78 Turkish Cup are shown in the following table.

Mersin İdmanyurdu (MİY) 1977–78 Turkish Cup game reports is shown in the following table.