STANDARDS SECTION XVIII - TOURNAMENT STANDARDS OF PERFORMANCE e.  Suspension of Play Procedures f. Lightning When the Extreme Weather Condition Suspension of Play is in effect, the  Supervisor, in consultation with the Tournament Physician, PHCP, and  Tournament Director, may suspend play according to the suspension  policy then in effect, until the temperature falls below the criterion for  Suspension of Play. The Supervisor has the authority to suspend play when lightning is  sighted. Play shall resume when the likelihood of a lightning strike has  passed. See Section IV.A.7 - Consecutive Withdrawals. 7.  Consecutive Withdrawals C.  ELECTRONIC REVIEW 1.  Required Use A WTA-approved electronic system for reviewing line calls and/or overrules  (“ELC System”) is authorized for use at WTA Tournaments with the court  surface for which the ELC System was approved. Use of an ELC System is required at minimum on center court during the  Main Draw at all WTA 1000 hard court Tournaments. In addition, if a court  will be equipped with an ELC System for the Main Draw and that court  also will be used for Qualifying, then the ELC System is required to be  used on that court during Qualifying. a.  WTA/ATP Combined WTA 1000 Tournaments b.  All Other WTA 1000 and WTA 500 Tournaments Use of an ELC System is required at minimum on center court for the Main  Draw at all WTA 1000 and WTA 500 hard and grass court Tournaments. A request for an Electronic Review of a line call or overrule by a player (team)  shall be allowed only on either a point-ending shot or when a player (team)  stops playing the point during a rally. (Returns are permitted, but then the  player immediately must stop.) 2.  Reviewable Points 367