The serve is a fault if:
- The server foot faults; see foot fault rules here.
- The server misses the ball when trying to hit it.
- The ball touches a permanent fixture, singles stick or net post before hitting the ground.
- After serving the ball touches the server’s partner, or touches anything the server is wearing or carrying.
It is not a fault if the server tosses the ball in the air and then decides to catch it.