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Diontae Johnson purchased a tennis ball machine to work on drops: “It's a smaller target so you have to really focus on the ball and the object coming at you…Now, when I
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![Tennis Ball Machine - Tennis ball launcher [the complete guide]](https://www.ertheo.com/blog/wp-content/uploads/2017/10/tennis-ball-machine-1.jpg "Tennis Ball Machine - Tennis ball launcher [the complete guide]")
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