STANDARDS SECTION XVIII - TOURNAMENT STANDARDS OF PERFORMANCE provided by the Tournament, if any, using the specific “On-Site  Conditions” Form. The Chair Umpire shall: xii. Send all arrival/departure details of designated officials to the WTA at  least twenty-one (21) days prior to the Tournament. xiii. Send information about on-site conditions such as transportation,  hotel, and meals to the designated officials at least seven (7) days  prior to the Tournament. xiv. Be familiar with all WTA electronic forms and Officiating Arena  content. c.  Chair Umpire i.  Ensure that the on-court rules are observed by the players, Line  Umpires, and Ball Persons. He/She must control the match in all  respects. He/She can be overruled by the Referee/Supervisor only in  matters of interpretation of law, not in matters of fact. ii.  Promptly and accurately score matches using the handheld or other  method provided by the WTA. Be competent in using the scoring  system. Track and record when balls are to be changed. iii.  Take charge of all Line Umpires and Ball Persons when on court. iv.  Be responsible for, in the absence of a Net Umpire or net device, the  calling of net cord service lets. v.  Ensure that play is continuous within the Rules by: (a) Maintaining the 90- and/or 120-second changeover, while  having the authority to delay the resumption of play until the  completion of the 90- and/or 120-second changeover during  televised matches; (b)  Maintaining a maximum of 25 seconds from when the ball goes  out of play at the end of the point until the time the ball is struck  for the first serve of the next point. If such a serve is a fault, then  the second service must be struck by the server without delay;  and (c)  Observing an approved warm-up period not to exceed five (5)  minutes. 329