PLAYERS SECTION V - TOURNAMENT DRAWS AND SCHEDULING (a) Sign in with the Supervisor or a WTA Operations staff member  by the Qualifying Sign-In deadline; (b) Submit a request to the Tournament Director and be approved  as an additional Qualifying Wild Card; and  (c) Sign in with the Supervisor/Referee thirty (30) minutes prior  to the scheduled start of play each day to be eligible for any  openings in the draw that day. See Section III.C - Wild Cards. If a spot becomes available prior to the start of the last  doubles match of the day/night, the Alternate will be  determined by the Sign-In for that day. However, where  there are no Alternates signed in, and the match affected by  An on-site Alternate team is eligible to substitute for all first  round matches and for second round matches when there are  first round byes. If a team chooses not to sign in on one day, it  will not lose its eligibility to sign in for subsequent days. If openings occur after the day of Sign-In deadline, in order  to be eligible, the team must sign in as an Alternate with or  contact the on-site Supervisor thirty (30) minutes prior to the  start of doubles play each day or by the Doubles Alternate Sign- In deadline determined by the on-site Supervisor/Referee and  indicated on the order of play.  Openings in the Main Draw will be filled by the next team on the  On-Site Entry Alternate List.  See Section III.B.1.b.i. i.  Advance Entry List  ii.  On-Site Entry  (b) After Sign-In Deadline  (a) At Sign-In Deadline  (i)  Prior to the Start of the Last Doubles Match of Day  69 c. Doubles*