In the competition, I rarely feel that players have been influenced by their opponent mistake judges and mistakes have increased and they lost. It is natural that the player should talk with his opponent, and he may have lacked knowledge to effectively utilize roving umpire.
At the same time, I also reflected on not having read the item of the roving umpire of the rule book so far, I tried searching.
The rule book of the Japan Tennis Association (JTA) is a paid book, and it is not posted on the homepage etc. On the page of the Regional Tennis Association, there was a site describing how to manage the tournament without the chair umpires, based on the JTA rule book.
According to the site, the referee is three types of referee, assistant referee, roving umpire. Roving umpire is on the court side. Its role is below.
■ Referees, Assistant Referee's Job
In the game where the chair umpire can not be held, the referee places an appropriate number of assistant referees, roving umpires, taking into consideration conditions such as the size of the event and layout of the venue.
1) Check the match coat (net, singles stick, surface, etc).
2) Make the match call (calling announcement of the match player).
3) Check the name and wear of the player and then toss before warming up.
4) Control game progress and make around coats for smooth game progress.
5) Handle toilet break and medical time-out.
6) Handle the heat rule in cooperation with a trainer in the tournament adopting it. When there is no trainer, the referee does the handle one needs.
7) If necessary, make a judgment about rule problem and fact problem.
8) If necessary, instruct the player team how to call the line.
9) If necessary, the referee can over-rule player team judgment. But after the appeal from player team he can not over-rule.
10) If necessary, in the clay court, BMI can be made.
11) If necessary, penalize code violators.
12) Confirm the end of the match, grasp the situation of interruption, and give instructions on game progress.
13) Sharing appropriate work with assistant referee, roving umpire.
■ Roving Umpires Job
In the game where the chair umpires can not be held, the roving umpire can contact the referee and the assistant referee, circulate the court in charge for smooth progress of the game, and respond to the problems in the court as necessary.
1) Do the work instructed by the referee. (The above ⑤ to ⑪ can also be exercised)
2) Check the coat before the game and confirm the arrival of the player team.
3) Check the name and wear of the player team and then toss before warming up.
4) Deal with the request from the player team. (Drink, racket replenishment etc)
5) Troubles that can not be solved, and report the result of the game to the referee.
To prevent opponent mistake judgment, you are requesting to exercise ⑤ to ⑪ (especially ⑦ to ⑨) against the auxiliary referee (roving umpire) on the court side.
However, in reality, there are few roving umpires who think that they are responsible for assisting judges themselves. I think that there are more problems that can not be solved simply by requesting the referee. Still, if you have a firm knowledge, you can increase what you can do, you should be able to argue dignified. Without knowledge, it can be seen as a mere emotional claim. Let's know well and respond well.