What does a referee call versus the players and line judges?

Question

Accepted Answer

The Tournament Director decides which matches use line judges, and a match may be officiated by a referee with or without them.

Referee, always: service foot faults, short serves and non-volley zone faults, plus all procedural and judgment calls, including score, point, second server, side out, hinders, distractions, damaged balls and replays.
Without line judges: players make "out" calls for the baseline, sidelines and centre service line on their end of the court.
With line judges: line judges call "out" or "service foot fault" for their assigned line, showing the out signal (outstretched arm pointing in the out-of-bounds direction), and assist with other calls when asked. Players call only the service court centreline on their end.
Hinders: you must validate a hinder called by a player. If valid, replay the rally. If not validated, it is a fault against the player.
Distraction: you decide when a player has distracted an opponent about to hit the ball. It is a fault against the distracting player.