We've found 2 phrases for single-minded (0.194 seconds):

if all you have is a hammer, everything looks like a nail »    With limited tools, single-minded people apply them inappropriately or indiscriminatelyIf a person is familiar with a certain, single subject/has with them a certain, single instrument, they may have a confirmation bias to believe that it is the answer to/involved in everything.

lean and mean »    Efficient because of having nothing in excess of what is needed, and single-minded in one's objective.

New:  We also know Zip Codes FYI!