In tennis when the opposing player is unable to return the first serve, this is known as an ace. An ace is also a hole in one in golf, and obviously card games.
Full Ace tennis
You can only be awarded an ace when you serve the ball.
Tennis.
An ace
No, an ace is when you serve the ball so well that it can not be returned.
ACE
ace
Serving an ace in tennis is worth just as many points as serving, playing the point out, and winning it. In other words, one point.
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It is called a service ace!
That is called an ace.