Jim,
Mea culpa. It is certainly the 17th, not the 15th. What confused me was the angle of the photo. The area to the right is the start of the 18th fairway. Barnes is driving to the left of the tree line so the 17th green and fairway aren't visible. I was also looking for a pond in front of the tee and when I didn't see one I assumed it couldn't be the 17th. Of course, the pond was added after the Open. I have a photograph of the 18th green taken at the same time - the crowd is about the same size and the weather looks the same.