Hi Fred,
Great to hear from you. Glad you find the course to be really helpful. It has tremendously helped with my serving, Pars tips are very insightful.
Yes you’re correct the rules state the the ball throw must be “near vertical” of course its impossible to get it completely straight every time, sometimes players will throw the ball back a bit, and will try to get it as straight as possible, umpires will give a little bit of allowance for a slightly off vertical throw but not too much.
Hope this helps Fred Glad your enjoying the course 🙂
