the service: The ball served has to pass over the net and land on the ground within the service court which is diagonally opposite the player's position. If the ball fails to land within the service court, the service is a fault. If the ball touches the net but lands correctly, the service has to be repeated.
The serving player has two attempts to deliver a valid service. If the second service fails too, the opponent scores.
In Grand Slam!, service faults are signalled with a popup text reading "FAULT". If a service touched the net, the text "NET" is shown.
the ball in play: The valid area for the ball to land when in play is the area in the opposite half of the court delimited by the inner sidelines, the net and the ground line. The ball may be hit before or after it hit the ground for the first time (the service may only be returned after the ball hit the ground).
The player loses the point if:
- He fails, before the ball has hit the ground twice consecutively, to return it, or
- He returns the ball, but the ball lands outside the valid return area or hits the net (if the ball touches the net, but lands in the valid area afterwards, the ball is good).
score in a game: If a player wins his first point, the score is called 15 for that player. On winning his second point, the score is called 30, on winning the third point, the score is called 40, and the fourth point won by a player is scored a game for that player except:
- If both players have won three points, the score is called deuce (40:40). The next point won by a player is scored advantage for that player.
- If the same player wins the next point, he wins the game. If the other player wins the next point, the score is again called deuce.
score in a set: The player who first wins six games wins a set, except that he must win by a margin of two games over his opponent and if necessary the set is extended until this margin is achieved.
tie-break: In Grand Slam!, the score of 6:6 games always leads to a tie-break: Every point a player scores counts one point and the first player to win seven points wins the game and the set provided he leads by a margin of two points. If necessary the game is extended until this margin is achieved.
winning the match: According to the settings made in the options menu the first player who wins 1, 2 (default) or 3 sets wins the match.