Issue link: http://itf.uberflip.com/i/536583
12 17. Exercise his best efforts to control the crowd. Whenever the spectators are impeding the progress of the match, the Chair Umpire should address them respectfully and request their cooperation. 18. Be responsible for the direction of the ballpersons during the match so that they assist, but do not disturb, the players. 19. Be responsible for all changes of balls and for determining if a ball is fit for play. The appropriate number of ball containers should be opened and inspected sufficiently in advance of each ball change so as to avoid any delay of the match. 20. Determine if a court continues to be fit for play. If a change in condition occurs during a match that the Chair Umpire considers sufficient to make the court unfit for play or if weather or other conditions require suspension of play, he should suspend play and report the same to the Referee. During a suspension and until a match is postponed, the Chair Umpire must ensure that he and all other on-court officials are ready to resume the match. If suspension is due to darkness it should be at the end of a set or after an even number of games in the set in progress. Upon suspension or any postponement by the Referee, the Chair Umpire shall record the time, point, game and set score, the name of the server, the side on which each player was situated and shall collect all balls in use for the match. 21. At the conclusion of a match make a full report to the Referee and Grand Slam Chief of Supervisors concerning all actions taken under the Grand Slam Code of Conduct during the match. Q. LINE UMPIRE A Line Umpire shall: 1. Carry out all his duties in accordance with the approved procedures of the GSB. 2. Dress uniformly with other Line Umpires as prescribed by the Grand Slam Tournament Committee. Line Umpires should not wear clothing in light colours that can interfere with the vision of the players. 3. Be on time for all assignments. 4. Take a position necessary to have the best view of his assigned line. 5. Call all balls on his assigned line only and not give opinions on calls on other lines. 6. Call foot faults when assigned to a baseline, sideline or centre service line.