| 2012 NL Leaders | |||||||||||||||||
| Name | Age | Team | G | W | L | IP | TBF | H | 2B | 3B | HR | R | ER | BB | SO | ERA | RA9 |
| Charles Fick | St. Louis | 2 | 0 | 0 | 1.2 | 9 | 3 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 5.39 | 5.39 | |
| Matt Palmer | 33 | San Diego | 3 | 0 | 0 | 2.0 | 10 | 2 | 0 | 0 | 1 | 2 | 2 | 2 | 2 | 9.00 | 9.00 |
| Zach Putnam | 25 | Colorado | 2 | 0 | 0 | 2.0 | 9 | 3 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0.00 | 0.00 |
| Brian Wilson | 30 | San Francisco | 2 | 0 | 0 | 2.0 | 12 | 4 | 2 | 0 | 0 | 2 | 2 | 2 | 2 | 9.00 | 9.00 |
| John Ely | LA Dodgers | 2 | 0 | 2 | 2.2 | 19 | 6 | 1 | 0 | 0 | 6 | 6 | 4 | 3 | 20.22 | 20.22 | |
| Rick Vanden Hurk | Pittsburgh | 4 | 0 | 1 | 2.2 | 16 | 5 | 0 | 0 | 0 | 4 | 4 | 1 | 3 | 13.48 | 13.48 | |
| Joseph Paterson | Arizona | 6 | 0 | 0 | 2.2 | 26 | 15 | 4 | 0 | 2 | 11 | 11 | 3 | 0 | 37.08 | 37.08 | |
| Jonathan Albaladejo | 30 | Arizona | 3 | 0 | 0 | 3.0 | 15 | 5 | 2 | 0 | 1 | 3 | 3 | 0 | 2 | 9.00 | 9.00 |
| Todd Redmond | 27 | Cincinnati | 1 | 0 | 1 | 3.1 | 22 | 7 | 1 | 0 | 1 | 4 | 4 | 5 | 2 | 10.81 | 10.81 |
| Daniel Runzler | San Francisco | 6 | 0 | 0 | 3.2 | 15 | 1 | 0 | 0 | 0 | 0 | 0 | 3 | 5 | 0.00 | 0.00 | |
| D.J. Carrasco | NY Mets | 4 | 0 | 0 | 3.2 | 18 | 6 | 0 | 1 | 2 | 3 | 3 | 0 | 3 | 7.36 | 7.36 | |
| Pedro Beato | 26 | NY Mets | 7 | 0 | 0 | 4.1 | 20 | 5 | 1 | 0 | 1 | 5 | 5 | 2 | 5 | 10.39 | 10.39 |
| Yusmeiro Petit | 28 | San Francisco | 1 | 0 | 0 | 4.2 | 22 | 7 | 0 | 0 | 0 | 2 | 2 | 4 | 1 | 3.85 | 3.85 |
| Justin Wilson | 25 | Pittsburgh | 8 | 0 | 0 | 4.2 | 26 | 10 | 3 | 0 | 0 | 1 | 1 | 3 | 7 | 1.93 | 1.93 |
| Bryan Morris | 25 | Pittsburgh | 5 | 0 | 0 | 5.0 | 20 | 2 | 0 | 0 | 0 | 2 | 1 | 2 | 6 | 1.80 | 3.60 |
| Tim Stauffer | 30 | San Diego | 1 | 0 | 0 | 5.0 | 24 | 7 | 0 | 0 | 1 | 4 | 3 | 3 | 5 | 5.40 | 7.20 |
| Tony Cingrani | Cincinnati | 3 | 0 | 0 | 5.0 | 22 | 4 | 0 | 0 | 1 | 1 | 1 | 2 | 9 | 1.80 | 1.80 | |
| Brian Fuentes | 37 | St. Louis | 6 | 2 | 2 | 5.0 | 26 | 6 | 1 | 0 | 1 | 5 | 5 | 5 | 6 | 9.00 | 9.00 |
| Peter Moylan | 34 | Atlanta | 8 | 1 | 0 | 5.0 | 21 | 3 | 0 | 0 | 1 | 3 | 1 | 2 | 2 | 1.80 | 5.40 |
| Dustin Moseley | 31 | San Diego | 1 | 0 | 0 | 5.0 | 22 | 5 | 2 | 0 | 1 | 5 | 5 | 2 | 4 | 9.00 | 9.00 |
| Francisco Cordero | 37 | Houston | 6 | 3 | 8 | 5.0 | 32 | 13 | 4 | 0 | 2 | 11 | 11 | 4 | 5 | 19.80 | 19.80 |
| Travis Blackley | 30 | San Francisco | 4 | 0 | 0 | 5.0 | 25 | 7 | 0 | 2 | 0 | 6 | 5 | 2 | 2 | 9.00 | 10.80 |
| Mike MacDougal | 35 | LA Dodgers | 7 | 0 | 0 | 5.2 | 32 | 9 | 2 | 0 | 0 | 5 | 5 | 6 | 4 | 7.94 | 7.94 |
| Josh Wall | 26 | LA Dodgers | 7 | 1 | 0 | 5.2 | 21 | 3 | 1 | 0 | 1 | 3 | 3 | 1 | 4 | 4.76 | 4.76 |
| Edwar Cabrera | 25 | Colorado | 2 | 0 | 2 | 5.2 | 33 | 9 | 1 | 0 | 3 | 9 | 7 | 7 | 5 | 11.11 | 14.29 |
| Michael Stutes | 26 | Philadelphia | 6 | 0 | 0 | 5.2 | 29 | 7 | 2 | 1 | 0 | 6 | 4 | 4 | 5 | 6.35 | 9.52 |
| Miguel Socolovich R. | 26 | Chi Cubs | 6 | 0 | 0 | 6.0 | 25 | 4 | 0 | 0 | 1 | 3 | 3 | 3 | 6 | 4.50 | 4.50 |
| Blake Parker | 27 | Chi Cubs | 7 | 0 | 0 | 6.0 | 32 | 10 | 0 | 0 | 3 | 7 | 4 | 5 | 6 | 6.00 | 10.50 |
| Aneury Rodriguez | 25 | Houston | 1 | 0 | 0 | 6.0 | 22 | 2 | 0 | 0 | 2 | 2 | 2 | 2 | 6 | 3.00 | 3.00 |
| Miguel Batista | 41 | Atlanta | 5 | 1 | 3 | 6.0 | 24 | 5 | 1 | 0 | 1 | 2 | 2 | 2 | 2 | 3.00 | 3.00 |
