The son of Kyllachy overcame greeness to get up late in the contest under a good ride by Andrea Atzeni.
Open 'n Shut broke well from the stalls and Andrea settled him in a nice posistion in the midfield.
When the leaders quickened with half a mile to go, Open n Shut was momentarily outpaced but Andrea gave him time to find his feet and he soon began to get the hang of things.
When switched around runners, Open 'n Shut began to motor and stayed on strongly to snatch victory in the shadow of the post, winning by a head.
Roger said: "I am delighted that Open n'Shut was able to make a winning debut. His owners have been patient and he has done it nicely. He was green and there should be more to come from him."