Just wondering if any of the better players use two spin servers vs high heat and spin second. I mean realatively flat, most fast serves do have some spin on them. Most everyone I play uses heat on the first serve. I have a bad shoulder so I stopped my flat serve and worked on a shoulder friendly slice first serve. I found people screw up more hitting my slice vs my hard flat. Unless the flat is on the line it can be blocked back often. It seems easier to get the slice in thus higher percentage and I get just as many free points off it. This might only work in 4.0 land and not anything much higher dunno.