McGrane finished with a birdie on the 10th hole as darkness fell, putting him at 1-under for the round and 12-under for the event.
A long wind delay Friday put the tourney off-schedule. Several golfers finished their third rounds Saturday but most did not.
A cut was made after the second round was completed early in the day's action.
Michael Hoey did complete his third round Saturday, firing a 7-under 65, and was the clubhouse leader at 10-under 206.
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