What’s the difference between a flat serve and a slice serve? That’s one of the most common serve questions we get and in this video OTI instructor Nadim Naser shows you the differences in super slow motion. Most players think they need to change the entire motion for the slice serve. In this video you will find out that the differences are very subtle. Mastering this is the key to disguising your first serves and will make them a lot more effective! | Online Tennis Instruction