The Braves traded Paul Seppala to the Pirates for saying:
 PS> Jays (a bottom team) and a .500 team actually did.  It does look to me
 PS> like Pettitte's record is quite good, but I'd be curious to see what
 PS> hentgen's record was and how often Pettitte was pitching behind Rogers
 PS> or the number 5 starter of the day.
I don't know if this will meet your criteria but I did a real quick and dirty 
analysis of Pettitte, Hentgen and for Milwaukee - McDonald and Karl 
(Milwaukee was the closest thing to a .500 club in the AL). I have line 
scores of their final results and it only lists who got the decision. They 
pitched in other games but didn't get the decision but since you're looking 
for W-L records, I thought this might do. Here is how they did (Excluding 
opening day, of course) after a loss and just for grins, after a win (D = 
Number of decisions after a win/loss):
              Loss        Win
           D  W- L    D  W- L
Pettitte  16 13- 3   13  8- 5
Hentgen   18 13- 5   12  7- 5
McDonald  17 10- 7    5  2- 3
Karl      11  6- 5   11  7- 4
Neagle    15 10- 5   14  7- 7
I hope this helps. Neagle's record, of course, includes his time with Atlanta 
as well as Pittsburgh. Pitching for Pittsburgh, Neagle was 10-2 after a loss 
and 4-4 after a win. With Atlanta, he was 0-3 and 3-3, respectively. I threw 
him in because Pittsburgh finished with the same record as Toronto.
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