The three-number score call
Before every serve in doubles, the server calls out three numbers: the serving team's score first, the receiving team's score second, and either 1 or 2 to indicate which partner is serving. For example, "4-2-1" means the serving team has 4 points, the opponents have 2, and the first server on the serving team is up. Getting this right matters — see rules for beginners for how this connects to the overall flow of a game.
Why only the serving team scores
This is the rule that surprises most new players coming from other racquet sports. If the returning team wins a rally, they don't get a point — instead, the serve passes to them, and they become the serving team. This makes the serving position genuinely valuable, since it's the only state in which you can add to your score.
How serving passes between partners
In doubles, each team normally gets two server turns per service — one partner serves until they lose a rally, then the serve passes to their partner, who serves until they lose a rally, at which point the serve passes to the other team entirely (a side-out). The one exception is at the very start of the game: the first serving team only gets one server turn before their first side-out.

Winning the game
Games are typically played to 11 points, win by 2. If the score reaches 10-10, play continues until one team leads by 2 clear points. Matches are often best-of-three games to 11, though formats vary by league and event.

