STANDARDS SECTION XVIII - TOURNAMENT STANDARDS OF PERFORMANCE *The WTA may substitute the WTA Logo positioned on the back  fence with 3-D signage placed on-court as a mat where the Net  Umpire chair surrounding is normally placed. (See examples in Appendix H – On-Court Signage.) The back fences, back walls, net, net posts, line umpire boxes, and  other fixtures on a court shall not be predominantly white, gray,  yellow, or any other light color that can interfere with the vision of  the players as determined by the Supervisor. There can be no banners with predominantly white, gray, yellow,  or any other light color backgrounds behind the ends of the  court. Background and lettering on rotating/LED banners should  be consistent with the color of the back walls. If placed in front of  back walls, rotating/LED banners can change only during a change  of ends. If placed in front of side walls, rotating banners can change  only after completion of any game. When lighter lettering needs to be used on a darker background,  PMS Color “Cool Gray” 4 to 6 (5 to 6 for outdoor tournaments) are the  preferred colors. No colors can be used that interfere with the vision  of the players as determined by the Supervisor. Clay and loose surface courts must be swept, watered, and lines cleared  before the start of all matches, if the Supervisor or Referee deems it  necessary. Clay courts also may need to be watered and/or swept  between sets if requested by the Supervisor or Referee. 310 d.  Court Preparation iii. Banners ii.  Behind the Court (c) Two (2) identifications of the court manufacturer (maximum  20.13 square feet/1.87 square meters) may be permitted on  the side of the court surface parallel to the sidelines. Such logo  must be placed at least 1.5 meters (4.92 feet) from the doubles  sideline. If used on a clay surface, the text must not protrude  above the surface of the court.