The ball is considered to be in play when the server hits the ball until the point is finally decided, unless a fault or let is called.
Players change sides of the court at the end of the first, third and then every odd game of each set. Players change sides at the end of each set, unless the score of the games is even. If the set score is even for that set, then players change sides at the end of the first game of the next set. During a tie-break, players change ends after every 6 points.