The 44-year-old bogeyed two of his last three holes in the morning round of the 36-hole International Sectional Qualifier, three-putting the 18th on the Old Course to post a level par 72.
Taking on the New Course in the afternoon, Harrington made birdies at the second and third and an eagle three at the eighth to sit comfortably inside the crucial top 13 who would qualify to join defending champion Jordan Spieth and Ireland’s Rory McIlroy, Graeme McDowell, Darren Clarke and Shane Lowry at Oakmont in Pittsburgh from June 16-19.
Harrington three-putted the last from 40 feet to end up tied for 16th, one shot outside a five-man play-off for the last three places. Harrington was playing alongside Paul Dunne, who shot 71 and 76 to miss out by five strokes.
As Peter Lawrie carded rounds of 76 and 81 to finish on 13 over 157, Frenchman Gregory Bourdy shot rounds of 67 (New) and 68 (Old) to top the qualifiers by two shots on nine under par 135 from Sweden’s Mikael Lundberg.
England’s Lee Slattery (138) was third with compatriot Matthew Baldwin tied for fourth on 140 with Andrew “Beef” Johnston, Frenchmen Gary Stahl and Romain Wattel and Sweden’s Alexander Noren.
Peter Hanson, and Italy’s Matteo Manassero shared ninth on 141 which left five players on two under 142 — Sweden’s Johan Edfors and Sebastian Soderbergh, India’s Jeev Milkha Singh, Dane Soren Hansen and Germany’s Maximilian Kieffer — to play off for the last three places. Kiefer holed a bunker shot at the first extra hole and Hansen birdied the second where Edfors bogeyed and was eliminated. Soderberg secured the last spot with birdie at the fifth play-off hole.