What is a fault in tennis?
The server has two serves for each point. A first-serve fault gives them a second serve. A second fault in a row is a double fault, and the receiver wins the point.
A serve that touches the net and then lands in the correct box is not a fault but a let, and is replayed.
Questions
What counts as a fault?
A serve landing outside the correct box, in the net, a foot fault, or swinging at the toss and missing.
What happens after a fault?
On a first serve you get a second serve. After a second fault you lose the point.
Sources
- ITF Rules of Tennis