STANDARDS SECTION XVIII - TOURNAMENT STANDARDS OF PERFORMANCE replacements) may be delegated to the Chief of Umpires, but the  Supervisor has final say on all assignments. iv.  Liaise with the Chief of Umpires and decide on the competence of  officials. v.  If necessary, conduct a clinic for local Chair Umpires and Line  Umpires. vi. In the absence of the Supervisor, be responsible for all matters of  tennis law. His/her decision is final. (See Appendix B.1 - Supervisor.) vii. Measure the courts, net posts/singles sticks, and lights and check the  quality of the nets and the availability of spare nets/straps prior to  the start of Qualifying. viii. Be responsible for conducting evaluations of Chair Umpires and  Chief of Umpires. ix. Arrive on-site at the Tournament either by 12:00 noon on the  Qualifying Sign-In day or on time for the Main Draw ceremony,  whichever is earlier. x. Arrive each day at least one (1) hour before the first scheduled  match, remain on-site at all times during matches, and leave no  earlier than thirty (30) minutes after the end of play.  xi. Confirm that all updated draws and the order of play have been  distributed at the end of play each day. xii. Be responsible for calling matches, including designating a visible  timepiece at a fixed location as the “official clock,” designating a  specific area from which matches shall be called, determining a  meeting point for players once the match is called, and coordinating  security escorts to/from match courts. xiii. When possible, assist the Supervisor in coordinating pre-match  interviews with the players and host broadcasters. xiv. When possible, assist the Supervisor and liaise with the host  broadcaster’s technicians for the equipment of coaches with  microphones for On-Court Coaching. xv. Not act as a Chair Umpire or Chief of Umpires for the Tournament. 327