The word advantage meaning in tennis is when both of the team players has gotten 40 points = to 3 points, this creates a "Deuce" and that is simply a tie. Now normally, it goes Love =0, then 15, 30, 40, and Game Point. But when each of the players have a game leading up to each having 40, it's sort of a tie. This is where the advantage comes in. Basically, when ever the server or the receivers, make a point, it will be ad. in or ad. out.
Ad. In = Servers advantage,
Ad. Out = Receivers advantage
Then whomever makes the next point, who has the advantage wins, and if you have the advantage and the other person gets a point, you lose the advantage and go back to deuce. I hope that helps! :D
My resources: Coming from a tennis player himself. :D
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