VII. THE COMPETITION VII. THE COMPETITION ultimately qualify and lucky losers may be accepted into the main draw. The qualify - ing competition commences when the first ball of the first qualifying match is struck. can only preserve his eligibility on one list. After the start of the qualifying, any vacancy will come from the Lucky Loser/ Alternate list. The Alternates will be placed below the players who lost in  qualifying and shall be ordered based upon their position in the most recent  Fed Ex ATP Rankings and then the FedEx ATP Doubles Rankings. D.Composition of Draws - Doubles:  The doubles main draw shall be composed as  follows: E. Qualifying ATP Tour:  The Alternate Sign In for ATP Tour singles qualifying shall begin no later  than 4 p.m. and close at 6 p.m. local time on the night prior to the start of the qualify - ing competition (Friday night when qualifying commences on Saturday). There shall  also be an Alternate sign-in on the day of first round qualifying play, this deadline is  one-half hour prior to the first scheduled qualifying match. This is a new sign-in and  any player who is on-site and with a Fed Ex ATP Ranking (singles or doubles) is el - igible to sign-in. Once the qualifying competition has begun, only those players who  121 120 1) ATP Tour 250/500 Tournaments: Direct Acceptances 3) ATP Challenger Tour Tournaments Total Direct  Wild Accepted Acceptances Cards 16 13 3 Singles Doubles Direct Acceptances Wild Draw Size Draw Size Advance Entry On-Site Cards 56 32 23 6 3 48 28 20 5 3 Singles Doubles Direct Acceptances Wild Draw Size Draw Size Advance Entry On-Site Cards 96 32 23 6 3 56* 28 20 5 3 48* 24 18 4 2 *Optional Draw Size for ATP Masters 1000 56 & 48 Draw Singles Singles Doubles Direct Acceptances Wild Draw Size Draw Size Advance Entry On-Site Cards 28/32 16 10 4* 2 48 16 10 4* 2 56 24 16 6* 2 *1 from Qualifying 2) ATP Masters 1000 Tournaments: Direct Acceptances ATP Challenger Tour. (See Challenger Addendum, page 403). The on-site al - ternate sign-in deadline is ½ hour prior to the first scheduled match on the first day  of the event. Withdrawals (main draw / qualifying) occurring after 3:00pm local time  the day prior to the start of the event and the official start of qualifying shall be filled  from this on-site alternate sign-in. The first priority for main draw is those players who  have preserved their eligibility, followed by players in ranking order from the original  Acceptance List who signed in for qualifying, followed by players who were not on the  Acceptance List or who did not preserve their position, using the most recent FedEx  ATP Ranking. Priority for a vacancy in the qualifying is based upon the most recent  FedEx ATP Ranking. Players must personally sign-in prior to the deadline to be eli - gible. Once the qualifying competition has begun, only those players who ultimately  qualify, lucky losers and eligible alternates may be accepted into the main draw. The  qualifying competition commences when the first ball of the first qualifying match is  struck. 1) Singles.  ATP Tour Masters 1000 and ATP Tour 500 qualifying draw size will be  one-half (1/2) the size of the main draw. The qualifying size for all ATP Tour 250  tournaments shall be 16 with 4 qualifiers. The singles qualifying shall be com - posed as follows: 2) Doubles Competition . The doubles qualifying shall be composed as follows: ATP Tour 500 Tournaments Qualifying: Total Accepted Direct Acceptances Wild Cards 4 3 1 a) ATP Tour Tournaments - Qualifying: Total Direct  Wild Accepted Acceptances Cards Challenger 80-110 4 3 1 Challenger 125 4 2 2 Total Accepted Direct Acceptances Wild Cards 16 13 3 16* 14 2 24 20 4 28 24 4 48 43 5 b) ATP Challenger Tour Tournaments - Qualifying: *  Denotes ATP Tour 250 Qualifying