Tennis players must serve or return the tennis ball back to opponent in order to continue the tennis game.
If by what you mean is are you allowed to hit the return before it bounces - NO.
You can only be awarded an ace when you serve the ball.
If the player is unable to hit the serve then it is an ace. But if the player hits the ball but does not return it, then it is a forced error.
A rally in tennis is a sequence of shots within a point.A rally starts with serve and return of the serve, and a sequence of shots until the point is won by one of the players.
No, only the person standing diagonal from the server at the baseline may return
You have to let the ball bounce in the service box before returning the serve.
Then the opposing player must return the ball to compete for the current point.
There ISN'T anything called a "backhand serve" in tennis.
To serve in tennis, is to hit a tennis ball with your racquet, aiming to score against an opponent.
It's measured because the first serve speed is a very important statistic. The faster a serve is, the harder it is for the opposing player to return. By knowing a person average first serve speed, you can then decide on what kind of strategy you can use to return the serve and win the point