Montgomerie, who could yet reach the Open by finishing within the top five at either the French or Scottish Opens, hit just a single shot too many when adding a level-par 70 to his morning’s three-under 66 while Olazabal fell to one under with rounds of 67 and 71, despite being five under after 14 holes.
“I made a great start,” said Olazabal. “But then had too many putts and when I hit a bad shot on the 16th that was it.”
Walker only finished behind compatriot James Morrison in a field of 96 competing for 10 qualifying places, but was delighted after his 10 previous attempts to qualify had ended in disappointment.
He said: “It’ll be one of the best things in my life.”