If a ball can't be called out with certainty, it is good. Calls when looking across a line or when far away . The call of a player looking down a line is much more likely to be accurate than that of a player looking across a line. When you are looking across a line, don't call a ball out unless you can clearly see part of the court between where the ball hit and the line. It is difficult for a player who stands on one baseline to question a call on a ball that landed near the other baseline.
T reat all points the same regardless of their importance .
All points in a match should be treated the same. There is no justification for considering a match point differently than the first point. Requesting opponent's help . When an opponent's opinion is requested and he gives a positive opinion, it must accepted. If neither player has an opinion, the ball is considered good.