Some matches are officiated by a solo chair umpire. In all these matches, the players have the primary responsibility for making the calls. The following principles apply in these matches. Player makes calls on his side of the court. Each player must make all calls on his side of the court.
Opponent gets benefit of the doubt.
Whenever a player is in doubt he must make the call in favor of his opponent. A player shall never seek aid from a solo chair umpire, spectator, teammate or coach in making a line call. Disagreement between partners over a call. When doubles partners disagree on a call, the point goes to the opposing team. The point is never replayed.