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What can be used to stop tennis balls from flying away in the tennis court? - hard tennis balls for cricketin calgary canada

I love tennis, but it's so hard to keep the balls in all. I'm not very good to play the ball to fly so often on the offense or the other side of the court. I play in a local park, where a tennis court in size. Thiknig'm a kind of lattice that are retiring from one place to another can ... What do you think you can use for this?