Titleist Brand Ambassador Zach Johnson is also playing well heading into the Open.  He recently edged Jason for a big win at the Crowne Plaza Invitational at Colonial.

Jason loves to experiment with his equipment and is a regular in the Titleist Tour Van.  With frequent adjustments, sometimes it pays to add a few notations on headcovers, as Jason did here with his 910F 13.5 degree fairway metal.

Rory arrived with a determined sense of purpose on Wednesday and spent a good deal of time honing his putting routine.

Defending champion, Titleist Brand Ambassador Rory McIlroy, is looking to recreate the magic he delivered last year at Congressional.

The Voke was also on hand at Olmypic.  Here he discusses wedge strategy with Vokey Tour Representative Aaron Dill (center) and Titleist Brand Ambassador Jason Bohn.  Jason earned a spot in this year's field by making it through a sectional qualifier at…

The 712 Series AP2 irons used by Titleist Brand Ambassador Ben Crane.  Check out the throwback headcovers on his fairway metals.

The staff members of the Titleist Tour Van got to work early on Wednesday, too.  Here, Scotty Cameron Tour Representative Kelly Moser lends a hand to Pro V1 loyalist K.J. Choi.

Titleist Brand Ambassador Kevin Na is competing in his third U.S. Open.

Welcome to San Franciso's famed Olympic Club, the oldest Athletic club in the United States (established in 1860).  2012 marks the 5th time that Olympic has played host to the U.S. Open, having previously served as the national championship site in…