I got lucky, and got this guy:

Ratings
Control	Velocity	Effectiveness	Stamina	Role
10	1	10	A

What can I reasonably expect? Can I put him in my 4-man rotation? I've a 7.5 mil '94 Saberhagen that is my #4.

Absolutely not.  I don't feel like IDing the guy right now, but with 10 control and 10 effectiveness it's a solid bet that he's got less than 50 IP.  99.999% it's under 100.  His A stamina means he could start a game and go deep, but afterwards his fatigue would be wrecked for a week.  Of real time.  You'll be best off using him in the bullpen.  Figure out who he is (search for "AAA just the charts") and then determine if he's a setup A, setup B, or maybe a closer.  If he's as good as he looks you might use him as a spot starter in a playoff series, but that's about it.

I can't identify the player for you without knowing his fielding/range ratings and whether he's a LHP or RHP.  But dahsdebater is right on all counts.

My best guess is you've got the 1926 Pete Alexander (55 IP version) or 1946 Ted Lyons (45 IP). 

Sorry to burst your bubble, wibr, but contrarian and dahsdebater are right. You've probably got a good reliever/spot starter, but stamina for a pitching prospect means something completely different than stamina for a hitter.  Stamina for a hitter correlates to PA/162.  Stamina for a pitcher only correlates to IP/G. 

Cool, thanks for the input. I appreciate it. Saberhagen especially thanks you all.