Issue link: http://itf.uberflip.com/i/447398
20 With respect to the third day, if the third singles match is at least three full sets in duration and decides the outcome of the tie, the fourth singles match will not be played. If the third singles match decides the outcome of the tie but is less than three full sets in duration, the fourth singles match must be played as scheduled (to the best of three tie-break sets). All decisions relating to the implementation of this regulation shall be the responsibility of the referee and if the tie is decided on the second day, the third and fourth singles matches must be played as scheduled to the best of three tie-break sets. (g) If a result has been obtained and weather or any other unavoidable hindrance forces play to be abandoned on the third day, teams are not required to complete the Tie unless otherwise decided by the Referee. If a result has not been obtained on the third day, due to weather or other unavoidable hindrance, teams must stay and play for two further days if necessary to conclude a Tie. If the Tie has not been concluded after two days further stay, every effort must still be made to conclude the Tie on a further third or fourth day. If any player's commitment makes it impossible for him to stay longer than two days after the agreed completion date, then the Tie shall be declared postponed by the Referee. The Davis Cup Committee will then notify the two Nations concerned of the new date by which the Tie must be played and concluded. Failure to conclude a Tie by the date fixed, or as provided above, shall render both teams liable to be defaulted. 38. INTERVAL BETWEEN MATCHES There shall be an interval of 20 minutes between the two singles matches u nless otherwise decided by the Referee. 39. SURFACE OF COURTS AND PLAYING CONDITIONS (a) Surface The ITF shall determine the surface type of the courts to be used in the Competition. These surfaces shall be acrylic; asphalt; carpet; clay; artificial clay; concrete; grass or artificial grass, as defined in the current version of the "ITF approved tennis balls, classified court surfaces & recognized courts: a guide to products and test methods". A Tie shall not be played on any other surface type except by mutual agreement between the two Nations competing in the Tie and subject to the approval of the ITF. If the Home Nation under normal conditions as determined by the Referee is unable to provide a playable match court at the scheduled starting time, or at any point during the Tie, the Referee shall in his absolute discretion, have the power to call of the match and/or Tie. In such circumstances the Home Nation shall be deemed to have forfeited the match and/or Tie and the Visiting Nation shall be declared the winner of the match and/or Tie. However, prior to making the decision to forfeit a Tie, the Referee must obtain the approval of the Executive Director or his designee. The Referee may also extend the starting time of a match