STANDARDS SECTION XVIII - TOURNAMENT STANDARDS OF PERFORMANCE b.  Chaperones Provided by the Tournament  Each Tournament, when selected to host testing of players, is obligated  to provide, at its own cost, adult female staff members and/or volunteers  who can assist the Official Anti-Doping Personnel and Supervisor with  the notification and observation of players selected for testing. The  Tournament shall be notified of the chaperone schedule at least seven (7)  days prior to the start of the Tournament.  It is recommended that a coordinator be appointed to recruit and assign Ball  Persons. There shall be a minimum of six (6) ball persons per match in the  Main Draw and Qualifying. Ball persons may not wear any predominantly  white, yellow, or other light color clothing that may interfere with the players’  vision, unless otherwise approved by the WTA. Ball persons’ uniforms should  not be identical to the Line Umpires’ uniforms. 4.  Ball Persons 5. Balls a.  Ball Type and Specifications i.  ITF-approved Type 2 Regular Duty balls from the WTA approved  ball list are to be used at all WTA Tournaments unless otherwise  approved by the WTA. At least twelve (12) weeks prior to the start  of its Main Draw, each Tournament must confirm with the WTA the  ball it intends to use. Failure to comply may result in a Tournament  Standards Violation and/or other sanctions. ii.  WTA Tournaments which are played the week before a Grand  Slam are required to use the same ball (brand and commercial  denomination) as that Grand Slam. iii.  Pressurized balls only will be used on the WTA. b.  Number and Procedure for Rotation during All Match Play High-altitude balls are not to be used unless conditions require, and  such use must be approved by the WTA and must be stated on the  Tournament Fact Sheet. At all Tournaments for all matches in both Qualifying Singles and Main  Draw singles and doubles, six (6) balls shall be used and changed after  the first seven (7) games and thereafter every nine (9) games. 304