Issue link: http://itf.uberflip.com/i/536583
11 play is suspended before the match begins, the players may choose again; the result of the toss stands. c. Determine if each player is dressed in accordance with the dress provisions of the Grand Slam Code of Conduct. Corrective action taking more than fifteen (15) minutes may result in a default. An appropriate re-warm-up may be authorized. 6. Have a hand held stopwatch which shall be used to time the warm-up (normally five (5) minutes), the twenty (20) seconds permitted between points, the ninety (90) seconds permitted during changeovers and the one hundred and twenty (120) seconds permitted during set breaks and all other specific time periods designated under the provisions of any Rule or Regulation. 7. Be responsible for having the appropriate number of balls on court for the match, including used replacement balls. The cans with new balls should be opened just before the match/ball change. 8. Determine all Questions of Fact arising during the match (including warm- up). 9. Ensure that the rules are observed by the players and all on-court officials. 10. Remove, rotate or replace any Line Umpire or Net Umpire whenever he/she decides it will improve the officiating of the match. 11. Make the first determination on all Questions of Tennis Law arising during the match, subject to the right of a player to appeal to the Referee in consultation with the Grand Slam Chief of Supervisors. 12. Announce the score after each point in accordance with GSB procedures. 13. Repeat the calls of a Line Umpire or Net Umpire only if the call is made in a weak voice or there is a close call that must be confirmed to remove any doubt from the minds of the players. 14. Mark a Scorecard during the match in accordance with the approved GSB procedures. 15. Overrule a Line Umpire only in the case of a clear mistake by the Line Umpire and only if the overrule is made promptly after the mistake is made. Clear foot faults not called by a Line Umpire, shall be called by the Chair Umpire consistent with the procedures for handling clear mistakes. 16. Be responsible for any ball mark inspection. There shall be no ball mark inspection except on clay courts.