Anyone been to the U.S. Open before? Need help

[qwerty330]

Okay, so I started becoming interested in tennis.  Noticed this week was the U.S. Open and decided to get some tickets.  Problem is I have no idea how it works.  On Stubhub, there are 3 types of tickets: Grounds Admission, Session 1-20, Arthur Ashe Stadium.  The prices vary a lot from like $20- $200. 
My question is which matches and how many matches do you get to see with each ticket type?
And yes, I did search on google but came up with nothing.
Appreciate the help.

 

[go rilla]

found this using google

Grounds Admission Tickets
The Grounds Pass or Grounds Admission is a relatively cheap way to see a lot of tennis. Grounds Admission is only available the first eight days of the tournament, with access to matches held in the field courts, Grandstand, and portions of the Louis Armstrong Stadium. For a hearty tennis fan, that can mean five or more matches. The Grounds Admission, however, does not grant admission to Arthur Ashe Stadium.

 

[limonyfresh]

I think it is either for the day session or the night session. The bigger matches are mostly at night if I'm not mistaken.