Jack excels at Downfield qualifying
Jack, who is based in Atlanta in the US, fired a four-under 69 to win the 18-hole shoot-out by a shot from Graham Gunn, of Canada, and England's John Hoskinson.
Jack was one of five Scots to progress through pre-qualifying with Alastair Webster, David Gilchrist, Fraser Mann and Graham Bell earning their spots in the over-50s major on Monday.
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Hide AdElsewhere. Paul O'Hara will need a final round in the low 60s if he is to register back-to-back wins on the EPD Tour in Germany. The Scot will go into today's final round of the EDP Tour event, the Pfaffing Classic at Golfanlage Pfaffing in joint fifth place, six shots behind Dutchman leader, Jurrian Van Der Vaart. O'Hara has had a pair of 70s for a four-under-par tally of 140.