STANDARDS SECTION XVIII - TOURNAMENT STANDARDS OF PERFORMANCE approval to the WTA prior to making any changes to the existing  surface and pay the cost of any testing deemed necessary by the  WTA. (b) If a new surface is being considered, approval must be given  by the WTA. If the Tournament fails to utilize the surface  recommended by the WTA, individual players may refuse to  participate in the Tournament, in which case the WTA neither  is responsible for such action by a player nor subject to any  penalties. (c) The surface must be maintained to the satisfaction of the  Supervisor/Referee. (d) Tournaments must ensure that the same surface is used for  Main Draw and Qualifying. If there are circumstances beyond  the control of the Tournament Director, Qualifying matches may  be held on a different surface, only with approval of the WTA. All practice courts, with a minimum of one (1) on site, must be  of the same surface and condition (i.e., indoor/outdoor) as the  Main Draw match court(s). (See the chart in sub-Section b below  for practice court requirements.)  (e) Unless otherwise approved by the WTA, outdoor courts shall  be laid out with the long axis north and south; geographic  considerations may modify this orientation in order to minimize  the adverse effect of serving into the sun. ii.  Court Measurements (a)  There must be at least 12 feet (or 3.66 meters) at each side of  the doubles sideline and 21 feet (or 6.40 meters) behind each  baseline. (This does not include the publicity/advertising placed  around the line umpires’ chairs). It is recommended that show  courts have 15 feet (4.57 meters) at each side of the doubles  sideline and 27 feet (8.23 meters) behind each baseline. At  indoor Tournaments, the ceiling must be a minimum of 40 feet  (or 12.19 meters) in height. (b) Court Dimensions must comply with those set out under the  ITF Rules of Tennis. It is the responsibility of the Tournament  Director to ensure, upon final preparation of the tennis courts  before the Tournament commences, that all court specifications,  including court measurements, comply with the standards set  forth in Appendix I – Court and Light Measurements. All court  306