How is it decided who will serve first in tennis match?

The method of deciding who will serve first in tennis match: before the game starts, both sides will clear the ball by tossing coins or rotating rackets, and the winner has the right to choose the service or venue; Those who choose to serve or receive the service should let the other side choose the venue; The person who chooses the venue should let the opponent choose to serve or receive the service. After that, the players take turns to serve in each game, and change sides when the game is odd. The person who wins six games first wins one game, 5:5, and wins two games in a row; At 6: 06, the game entered a tiebreak.