I was wondering if that was an option, but haven't tried.
I found another way to get there.  I called mlb tech support to thank them 
for a great job.
1. Go to http://www.mlb.com
2. use the find command of your screen reader to get to the login, fill in 
the e-mail address and password edit boxes and press enter.
3.  Now issue a find command for gameday, and you will land on a link called 
accessible gameday.
4. Enter the table find the game and feed you want and press enter.  Greaat 
audio as well as visible controls for the player.