Как заявляются на турниры серии Challenger?

Друзья, подскажите - какая процедура заявки на турниры серии Challenger? По Futers все понятно - IPIN и он-лайн, а как с челленджерами - искал-искал - ничего не нашел.

http://www.atpworldtour.com/Corporate/Rulebook.aspx

7 глава, The Competition

Кому будет интересно:
ENTRY PROCESS
Players who wish to officially enter Challenger events can enter via the ATP Player Zone entry
system. To register for this system you must be ATP ranked. Players can sign up for this system
which charges a $200 fee by logging on to https://atp-playerzone.com/login.asp. All Entries into
Challengers must be sent to the ATP office in Florida 21 days prior to the Monday of the Tournament
Week. Those who are not directly accepted into Main Draw and wish to play qualifying must report to
qualifying sign-in.