| 2012 NL Leaders | |||||||||||||||||
| Name | Age | Team | G | W | L | IP | TBF | H | 2B | 3B | HR | R | ER | BB | SO | ERA | RA9 |
| Rob Scahill | Colorado | 6 | 0 | 0 | 8.2 | 33 | 7 | 2 | 0 | 0 | 1 | 1 | 3 | 4 | 1.04 | 1.04 | |
| J.J. Hoover | Cincinnati | 28 | 1 | 0 | 30.2 | 123 | 17 | 3 | 1 | 2 | 7 | 7 | 13 | 31 | 2.05 | 2.05 | |
| Mike McClendon | 27 | Milwaukee | 9 | 0 | 0 | 14.0 | 69 | 20 | 5 | 0 | 1 | 11 | 10 | 5 | 4 | 6.43 | 7.07 |
| Charles Fick | St. Louis | 2 | 0 | 0 | 1.2 | 9 | 3 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 5.39 | 5.39 | |
| Jose Contreras | 41 | Philadelphia | 17 | 1 | 0 | 13.2 | 56 | 13 | 4 | 0 | 1 | 10 | 8 | 3 | 15 | 5.27 | 6.58 |
| Julio Teheran | 22 | Atlanta | 2 | 0 | 0 | 6.1 | 24 | 5 | 0 | 0 | 0 | 4 | 4 | 1 | 5 | 5.69 | 5.69 |
| Shelby Miller | St. Louis | 6 | 1 | 0 | 13.2 | 54 | 9 | 1 | 0 | 0 | 2 | 2 | 4 | 16 | 1.32 | 1.32 | |
| Ernesto Frieri | 27 | San Diego | 11 | 1 | 0 | 11.2 | 50 | 9 | 1 | 0 | 2 | 5 | 3 | 4 | 18 | 2.31 | 3.86 |
| Justin Wilson | 25 | Pittsburgh | 8 | 0 | 0 | 4.2 | 26 | 10 | 3 | 0 | 0 | 1 | 1 | 3 | 7 | 1.93 | 1.93 |
| Brian Wilson | 30 | San Francisco | 2 | 0 | 0 | 2.0 | 12 | 4 | 2 | 0 | 0 | 2 | 2 | 2 | 2 | 9.00 | 9.00 |
| Mike Gonzalez | 34 | Washington | 47 | 0 | 0 | 35.2 | 151 | 31 | 10 | 1 | 2 | 14 | 12 | 16 | 39 | 3.03 | 3.53 |
| Michael Ekstrom | 29 | Colorado | 15 | 0 | 0 | 15.2 | 72 | 21 | 4 | 1 | 1 | 11 | 11 | 2 | 9 | 6.32 | 6.32 |
| Jonathan Albaladejo | 30 | Arizona | 3 | 0 | 0 | 3.0 | 15 | 5 | 2 | 0 | 1 | 3 | 3 | 0 | 2 | 9.00 | 9.00 |
| Evan Meek | 29 | Pittsburgh | 12 | 0 | 0 | 12.0 | 57 | 14 | 2 | 0 | 1 | 9 | 9 | 6 | 8 | 6.75 | 6.75 |
| Jose Valdez | 30 | Houston | 12 | 0 | 0 | 12.0 | 57 | 12 | 1 | 0 | 1 | 4 | 3 | 8 | 10 | 2.25 | 3.00 |
| Nick Vincent | San Diego | 27 | 2 | 0 | 26.1 | 105 | 19 | 3 | 0 | 2 | 5 | 5 | 7 | 28 | 1.71 | 1.71 | |
| Takashi Saito | 42 | Arizona | 16 | 0 | 0 | 12.0 | 60 | 17 | 8 | 0 | 4 | 14 | 9 | 5 | 11 | 6.75 | 10.50 |
| Doug Slaten | 32 | Pittsburgh | 10 | 0 | 0 | 13.0 | 55 | 9 | 1 | 0 | 1 | 4 | 4 | 8 | 6 | 2.77 | 2.77 |
| Randy Choate | 37 | LA Dodgers | 36 | 0 | 0 | 13.1 | 64 | 13 | 1 | 0 | 1 | 7 | 6 | 9 | 11 | 4.05 | 4.73 |
| Daniel Otero | San Francisco | 12 | 0 | 0 | 12.1 | 57 | 18 | 5 | 1 | 0 | 11 | 8 | 2 | 8 | 5.84 | 8.03 | |
| Travis Blackley | 30 | San Francisco | 4 | 0 | 0 | 5.0 | 25 | 7 | 0 | 2 | 0 | 6 | 5 | 2 | 2 | 9.00 | 10.80 |
| Mike Pelfrey | 28 | NY Mets | 3 | 0 | 0 | 19.2 | 85 | 24 | 2 | 1 | 0 | 5 | 5 | 4 | 13 | 2.29 | 2.29 |
| Jeurys Familia | 23 | NY Mets | 8 | 0 | 0 | 12.1 | 52 | 10 | 0 | 1 | 0 | 8 | 8 | 9 | 10 | 5.84 | 5.84 |
| Christian Garcia | 27 | Washington | 13 | 0 | 0 | 12.2 | 48 | 8 | 2 | 0 | 2 | 3 | 3 | 2 | 15 | 2.13 | 2.13 |
| Thomas Layne | 28 | San Diego | 26 | 2 | 0 | 16.2 | 68 | 9 | 1 | 1 | 0 | 6 | 6 | 3 | 25 | 3.24 | 3.24 |
| Joseph Paterson | Arizona | 6 | 0 | 0 | 2.2 | 26 | 15 | 4 | 0 | 2 | 11 | 11 | 3 | 0 | 37.08 | 37.08 | |
| Michael Stutes | 26 | Philadelphia | 6 | 0 | 0 | 5.2 | 29 | 7 | 2 | 1 | 0 | 6 | 4 | 4 | 5 | 6.35 | 9.52 |
| Jeff Beliveau | Chi Cubs | 22 | 1 | 0 | 17.2 | 86 | 21 | 4 | 0 | 5 | 9 | 9 | 12 | 17 | 4.58 | 4.58 | |
| Bryan Morris | 25 | Pittsburgh | 5 | 0 | 0 | 5.0 | 20 | 2 | 0 | 0 | 0 | 2 | 1 | 2 | 6 | 1.80 | 3.60 |
| Matt Palmer | 33 | San Diego | 3 | 0 | 0 | 2.0 | 10 | 2 | 0 | 0 | 1 | 2 | 2 | 2 | 2 | 9.00 | 9.00 |
