At the end of each standard game, the receiver shall become the server
and the server shall become the receiver for the next game.
In doubles, the team due to serve in the first game of each set shall decide
which player shall serve for that game. Similarly, before the second game
starts, their opponents shall decide which player shall serve for that game.
The partner of the player who served in the first game shall serve in the third game and the partner of the player who served in the second game shall serve in the fourth game. This rotation shall continue until the end of the set.
May a doubles team switch its serving
order at the beginning of any set or Match Tiebreak?
Yes. There is
no requirement that any doubles team retain the same serving
order for a new set or Match Tiebreak.