Titleist Brand Ambassador Marc Leishman cleans the grooves in his new Prototype MB 9-iron.

Marc plays a mixed set of Titleist AP2 and MB irons.

The moment just after impact...

Here's a closer look.

This new Prototype MB iron belongs too... (Note the custom-stamped "C") ... Titleist Brand Ambassador Charley Hoffman.

The Titleist Tour Van has pulled out of Aronimink, but stay tuned tomorrow for more updates.

Here's what they look like in the bag.

Marni Ines of Titleist Golf Club R&D looks on during Gary's first testing session.

Woodland plays Titleist Pro V1 golf balls.

Ryuji games 4-9 MB irons with True Temper Dynamic Gold shafts.