My vote would be Macrahanish's opening hole, which some describe as the best opening hole in the world. Putting aside the fact that Preswtick, Merion, Oakmont, The Old Course, Yeamans Hall and Pine Valley have better opening holes, the lack of water there most of the time greatly diminishes the idea. When I have been there and in almost all pictures I see you are hitting over sand and not water. Not to say it isn't an interesting and fun opening hole by best opener in the world it is not.