UNDERGROUND
MLB tryouts in general are open to the baseball public--if you think you can play you can try out
In truth if there are two "ballplayers" at any such event that is a lot
There are +/- 750 players in the "bigs"--as you can see the odds are against any one player when it comes to making it.
It is a long hard road and it takes a load of talent plus a touch of good luck to make it happen, like being in the right place at the right time.
TRhit