Grooves on a golf club help create spin on the ball. The better the player and the more clean they hit their shots, the more spin they will get. When a ball is pinched between the club face and the ground, the grooves on the club work with the back of the ball to create spin. On a not so clean shot, there will be grass or dirt between the club face and the ball and thus not as much spin will result.
Studies show that the changes do not have that big of an affect on most amateurs. The better skilled amateurs and the pros are noticing a difference more out of the rough than off the fairway. I don't think most golfers notice a difference off the fairway at all to be honest. The fact that it is more difficult to get the ball to spin out of the rough now with the new regulations puts more pressure on tour players to land their tee shot in the fairway.
By: Maria Palozola