STANDARDS SECTION XVIII - TOURNAMENT STANDARDS OF PERFORMANCE Scoreboards and video screens may be placed a minimum of forty (40) feet  (12.19 meters) above the court surface, as long as they do not interfere with  play and/or present a distraction to the players. All WTA 1000, WTA 500, and WTA 250 Tournaments must provide electronic  timing devices controlled directly by the Chair Umpire’s tablet (“shot clocks”)  on each match court from the first day of Qualifying through the Main Draw  finals. It is optional for WTA 125 Tournaments to provide shot clocks. If a WTA 125  Tournament provides shot clocks, they must be provided on each match court  from the first day of Qualifying through the Main Draw finals. 34. Shot Clocks a. Size b.  Number and Placement Each shot clock panel should be a minimum of two (2) feet by two (2) feet  (0.6 meters by 0.6 meters) and a maximum of three (3) feet by two (2) feet  (0.91 meters by 0.6 meters). Each court is required to have a minimum of two (2) shot clocks clearly  visible to the players and the Chair Umpire. The shot clock panels must  be placed on the back wall or corner of the court on the left far and right  far side from the Chair Umpire. In addition to the two (2) shot clock placements specified above, each  Tournament may show the shot clock timing in other locations on or  around the court and spectator areas. c.  Additional Positions 35. Scoring System a.  All Singles (Main Draw and Qualifying) matches in all WTA Tournaments  are the best of three (3) tie-break sets. All Main Draw Doubles matches in  all WTA Tournaments are the best of three (3) sets with No-Ad scoring in  the first two (2) sets and a 10-point match tie-break as the third set. The  WTA has the right to authorize the use of alternative scoring systems at  WTA Tournaments and to award appropriate ranking points. b.  The organizing committee of each Grand Slam Tournament will decide  which scoring system will be used at each Grand Slam. 337