it means game point
The term advantage belongs to tennis.
Advantage
the server
the server has the advantage to win the game after deuce
advantage
Deuce
Following a deuce in tennis, the score is referred to as "advantage" for the player who wins the next point.
advantage in favor of the server in tennis; advantage in favor of the receiver. Terms used after a deuce, i.e., 30-all.
I don't know try another one!
after you get deuce and the server wins the point. You call it 'ad in'
In tennis, the term "advantage" is significant after deuce because it represents a player needing only one more point to win the game. It gives them a slight edge over their opponent, who must win two consecutive points to regain the advantage and win the game.
After a deuce in tennis, the score is referred to as "advantage" for the player who wins the next point. If that player wins the following point as well, they win the game.