I dunno really, but there was an autograph signing years ago when I went to a game. Todd Zielle, Rene Arocha (which I thought I was going to retire on), Omar Olivares and some other guy I can't recall. Zielle was very late, and signed very few. I started not liking him so much (mildly). But TM has helped me on my road to recovery. It was right in the concourse, but things may have changed since then.
Edit - and this is from some guy at some other forum.
Things have changed a bit. There are now only 4 players that sign and 2 veterans. The 4 current players sign from 6-6:30. They are usually "B" team players. Don't expect Albert, Yadi, etc. And no player that is in the starting line up with sign. They won't allow it. The veteran sign from 6:30-7, but alot of times they will stay a little longer than 7 if there is a line.
This year they have been puting 2 players at one table. So there are 2 lines in 2 locations at the stadium (usually the West and East ramps) So if you are in line, you will get both of them.
Hope this helps.