Ayr kept tabs on Morton among the top-four pace-setters with a valuable 1-0 win at Cappielow Park.
It was fitting that a former Greenock man provided the key breakthrough. Scott McLaughlin found the top left corner after 35 minutes, pouncing on a rebound after Derek Gaston saved his initial effort.
The home side contributed to a lively match, but Ayr marginally deserved the result for their defensive solidity. Declan McManus and Robbie Crawford had the best chances for the Ton, but both were wasted.