Most Runs Allowed in a Season, All Earned

In 2009, Houston's Roy Oswalt allowed 83 runs in 181 1/3 innings pitched. Every single one of his runs were earned. He became just the twentieth pitcher in major league history to allow more than 70 runs in a season with all of them earned. The full list:

1. Joel Pineiro, 2005 SEA, 118 R
2. Dick Ruthven, 1976 ATL, 112 R
3. Frank Tanana, 1990 DET, 104 R
4. Brian Anderson, 1998 ARI, 100 R
5. Daisuke Matsuzaka, 2007 BOS, 100 R
6. Rick Sutcliffe, 1988 CHC, 97 R
7. Kelvim Escobar, 2004 ANA, 91 R
8. Curt Schilling, 2006 BOS, 90 R
9. Bobby Jones, 1998 NYM, 88 R
10. John Thomson, 1998 COL, 86 R
11. Omar Olivares, 1992 STL, 84 R
12. Roy Oswalt, 2009 HOU, 83 R
    
13. Scott Erickson, 2000 BAL, 81 R
14. Art Decatur, 1927 PHI, 78 R
15. Dennis Ribant, 1967 PIT, 78 R
    
16. Hideki Irabu, 1998 NYY, 78 R
17. Ryan Dempster, 1999 FLA, 77 R
18. Hideo Nomo, 2004 LAD, 77 R
19. John Farrell, 1993 CAL, 74 R
20. Phil Regan, 1961 DET, 70 R