"Z" is for Zach, as in Titleist Brand Ambassador Zach Johnson.

And "A" is for Adam, as in Titleist Brand Ambassador Adam Scott.

Of course, "A.S." also stands for Adam Scott.

Adam Scott put the new 910F 15.0 prototype fairway metal in play last week at The Barclays.

Check out these Scotty Cameron prototypes.

Here's a closer look at a Scotty Cameron 009 Tour Prototype.

Titleist Brand Ambassador Rory McIlroy talks to his caddie on the range.

Titleist Brand Ambassador Brad Faxon works with Pro V1x loyalist Hunter Mahan on the putting green.

Oh, to be a fly on that ball.