I recently bought a tennis stringer. I looked on tennis-warehouses racket information for information on stringing my wilson prostaff rok. It said to use a one-piece stringing. When I took it to my local pro, he said that I should use a two-piece string job because my crosses started at the bottom, and the should always start at the top. He said that this is done to prevent a mushrooming effect as you string the crosses on the way up. I'd really like to know. thanks.