The new prototype 913 drivers, side by side. That's the 913D2 on the left and the 913D3 on the right. Make sure to check back in the coming days for more photos, details and initial player reaction to the new prototype 913D2 and 913D3 drivers!

Brendan takes a lash with his new prototype 913D3.

This is how a teed-up Pro V1 or Pro V1x will view the prototype 913D3.

Stephanie Bezilla, Titleist's Director of Metalwood Product Development, is on hand this week at Congressional to lend support during seeding and provide product details on the new 913 prototypes. Here, she answers a question posed by Titleist Brand Ambassador…

A view of the prototype 913D2 in the play position.

Titleist Tour Rep Chris Tuten gives Titleist Brand Ambassador Bobby Gates more details about the new 913 driver.

Monday marked the official start to the tour seeding and performance validation for Titleist's new prototype 913D2 and 913D3 drivers.

Where there are new prototype drivers, there are also new prototype driver headcovers.

Titleist Brand Ambassador Brendan Steele, deep in discussion with Titleist Tour Reps Scott Cuppett (left) and Larry Bobka.

A good look at the toe and crown of the prototype 913D3.  If you compare this photo to the same shot of the prototype 913D2, you'll notice that the back edge of the 913D3 is a little deeper.