What is it called when a ball hits the top of the net and lands in the correct service court?

Answer 1

If the ball hits the net on a serve and it still goes over and lands on the other side of the service box then it is called a "let". If the ball its the net and does not go over, or into the service box then it called a "vault". The worst thing a player can do is double vault, which means they missed the service box twice in a row.

Answer 2

It is called a "let" and does not count as either a legal serve or a fault. There are other forms of a 'let' or uncounted serve: when an opponent is not ready; when another ball, person, animal, or foreign object enters the court during a serve; or when an umpire overrules a previous stoppage of play during a serve.

Answer 3

Let.