While the best player in the world is endorsing the change in grooves, the decision doesn’t get the blessings of the Acushnet Company, which oversees the Titleist, FootJoy and Cobra Golf brands.

"Once the new groove dimensions were finalized, in the rule as adopted in August 2008, we developed a new groove for wedges and began Tour player testing in March 2009. We have since tested a significant number of Tour players comparing the current and the new groove configurations,'' a company statement attributed to