Among the first to put the new 913D2 through its paces was Titleist Brand Ambassador Jimmy Walker, seen here working with Titleist’s Director of Tour Promotions, Chris Tuten.

Two new 913 driver heads wait on the Titleist Tour Van, minutes away from their first drives in the hands of the finest players in the game.

On Day 2 of 913 seeding, Titleist Club R&D continued to work closely with Titleist full-line Brand Ambassadors like Kris Blanks (pictured above) to collect feedback and validate the performance of the new prototype 913 drivers.

Titleist Brand Ambassador Tom Gillis warms up with his new prototype 913D3. Tom enjoyed his best career finish on Tour earlier this year when he shared runner-up honors at the The Honda Classic.

A closer look at the new 913 headcover.

Titleist's Vice President of PGA Tour Club Promotion, Larry Bobka (back to camera) and Stephanie Bezilla discuss the potential results that an adjustment to a player's SureFit hosel setting will have. 

Another long hitter, Titleist Brand Ambassador Seung-yul Noh is also in the field this week at Congressional.  S.Y. currently ranks 21st in Driving Distance on the PGA Tour with a 298.5 yard average.

Here's a closer look at the 7.5° prototype 913D3 head that Mark tested.

Stephanie Bezilla, Titleist's Director of Metalwood Development, calibrates a Trackman launch monitor just before working with S. Y. to dial in his flight conditions with his new prototype 913D3.

Driving the ball is one of Jimmy's strengths.  This year his average measured clubhead speed with the driver is 117.0 mph, resulting in an average ball speed off the driver of 173.66 mph.  Don't be surprised if those numbers go up even higher with a…