One important factor when putting on spiked or bumpy greens is the necessity for controlling the ball at, and immediately after, impact. A putt that is stroked in the normal way has almost no spin as it leaves the club head. For the first few inches—depending on the length of the putt—the ball is essentially skidding. Then it begins to pick up its own rotation and rolls toward the hole. When greens are unusually bumpy, such as those we all faced at the Canadian Open two weeks ago, this lack of initial spin becomes a problem, because the ball may well hit something quite small and be deflected before it develops its own inertia. Any fraction of an inch that the ball is knocked off line early, of course, becomes a couple of feet by the time it reaches the hole. To help solve the control problem with such a putt, I suggest that you try hitting it on the upswing. This slight change in the stroke will give the ball overspin from the moment it leaves the club head. The overspin will help the ball remain on line through those important first few inches.