They have now hung 8 ER on Zack Greinke and Adam Wainwright on back-to-back days, which is incredible since both are Cy Young caliber pitchers (Greinke took home the award in 2009, Wainwright finished in top 3 in 2009 & 2010).
The last time starting pitchers surrendered 8 ER to the Cubs on back-to-back days was July, 2009:
Mike Hampton (Astros): 4.0 IP, 9 ER July 29th, 2009
Russ Ortiz (Astros): 2.1 IP, 9 ER July 30th, 2009
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and before that...
Mark Gardiner (Expos): 1.0 IP, 8 ER August 3, 1990
Kevin Gross (Expos): 5.0 IP, 9 ER August 4, 1990
and before that...
Bucky Walters (Phillies): 3.2 IP, 9 ER May 20, 1938
Claude Passeau (Phillies): 6.2 IP, 8 ER May 21, 1938