A let is a call that allows a point to be played again. In tennis, a let can be called for multiple reasons. One reason for a let to be called is if a serve lands in the correct service box, but hits the net first. A let will be called and the server will serve again. Another reason for a let to be called is if something disrupts play or presents a hazard. An example of this would be a ball from another court rolling onto a tennis court while a point is being played. In this instance, the point would be stopped and replayed.
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In tennis, a let is where a player serves and the ball clips or brushes the top of the net chord and still lands in the serice box, and when this happens, the serve is played again without a fault taking effect in the scoring.
If the ball bounces on the net and still bounces over to the opposing team of the server and in the correct box, a let, it is the reciever's call because the reciever must make all the calls for the tennis balls.
Refer to Section 22 (page 18) of the USTA rule book, per the link below (n.b., the rules and the link are subject to change).