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You've probably heard of the concept of swinging up towards the ball when serving but couldn't really figure out how will then the ball go down.
This video explains it in a simple and a more complex way in the second part, when I analyze Milos Raonic serve in slow motion and show you that he literally serves up when making contact with the ball.
![](https://i.ytimg.com/vi/1Y14gsjTAoM/mqdefault.jpg)