| 2012 NL Leaders | |||||||||||||
| Name | Age | Team | G | IP | TBF | BB% | K% | BABIP | LOB% | GB% | HR/Air | ERA | FIP |
| Matt Lindstrom | 32 | Arizona | 12 | 10.67 | 45 | 4.4% | 22.2% | .312 | 77% | 53% | 0% | 2.53 | 2.10 |
| John Lannan | 28 | Washington | 6 | 32.67 | 144 | 9.7% | 11.8% | .314 | 71% | 54% | 0% | 4.13 | 3.74 |
| Rodrigo Lopez | 37 | Chi Cubs | 4 | 6.33 | 34 | 14.7% | 5.9% | .320 | 57% | 27% | 0% | 5.69 | 5.34 |
| Daniel Otero | San Francisco | 12 | 12.33 | 57 | 3.5% | 14.0% | .409 | 50% | 71% | 0% | 5.84 | 2.80 | |
| Travis Blackley | 30 | San Francisco | 4 | 5.00 | 25 | 8.0% | 8.0% | .350 | 33% | 43% | 0% | 9.00 | 3.53 |
| Zach Putnam | 25 | Colorado | 2 | 2.00 | 9 | 11.1% | 0.0% | .429 | 100% | 38% | 0% | 0.00 | 4.63 |
| Zach Duke | 29 | Washington | 8 | 13.67 | 56 | 7.1% | 17.9% | .262 | 87% | 40% | 0% | 1.32 | 2.54 |
| Brandon League | 29 | LA Dodgers | 28 | 27.33 | 108 | 13.0% | 25.0% | .274 | 78% | 59% | 0% | 2.31 | 2.80 |
| Shelby Miller | St. Louis | 6 | 13.67 | 54 | 7.4% | 29.6% | .273 | 86% | 44% | 0% | 1.32 | 1.88 | |
| Yusmeiro Petit | 28 | San Francisco | 1 | 4.67 | 22 | 18.2% | 4.5% | .438 | 82% | 35% | 0% | 3.85 | 5.27 |
| Mike Pelfrey | 28 | NY Mets | 3 | 19.67 | 85 | 4.7% | 15.3% | .358 | 82% | 53% | 0% | 2.29 | 2.42 |
| Phillippe Aumont | 24 | Philadelphia | 18 | 14.67 | 65 | 13.8% | 21.5% | .263 | 70% | 70% | 0% | 3.68 | 3.26 |
| Thomas Layne | 28 | San Diego | 26 | 16.67 | 68 | 4.4% | 36.8% | .250 | 60% | 48% | 0% | 3.24 | 1.21 |
| Jeurys Familia | 23 | NY Mets | 8 | 12.33 | 52 | 17.3% | 19.2% | .303 | 58% | 50% | 0% | 5.84 | 3.70 |
| Jaye Chapman | 25 | Chi Cubs | 14 | 12.00 | 50 | 20.0% | 24.0% | .308 | 72% | 50% | 0% | 3.75 | 3.63 |
| Michael Stutes | 26 | Philadelphia | 6 | 5.67 | 29 | 13.8% | 17.2% | .350 | 45% | 20% | 0% | 6.35 | 3.48 |
| Daniel Runzler | San Francisco | 6 | 3.67 | 15 | 20.0% | 33.3% | .250 | 100% | 33% | 0% | 0.00 | 3.67 | |
| Hector Ambriz | 28 | Houston | 18 | 19.33 | 83 | 13.3% | 26.5% | .318 | 67% | 48% | 0% | 4.19 | 2.87 |
| Chad Qualls | 34 | Pittsburgh | 17 | 13.67 | 58 | 3.4% | 10.3% | .292 | 31% | 55% | 0% | 6.58 | 2.69 |
| Vinnie Chulk | 34 | Milwaukee | 7 | 9.00 | 48 | 8.3% | 20.8% | .515 | 52% | 26% | 0% | 10.00 | 2.24 |
| John Ely | LA Dodgers | 2 | 2.67 | 19 | 21.1% | 15.8% | .750 | 45% | 55% | 0% | 20.22 | 6.50 | |
| Rick Vanden Hurk | Pittsburgh | 4 | 2.67 | 16 | 6.3% | 18.8% | .455 | 43% | 55% | 0% | 13.48 | 3.13 | |
| Justin Wilson | 25 | Pittsburgh | 8 | 4.67 | 26 | 11.5% | 26.9% | .667 | 92% | 19% | 0% | 1.93 | 2.06 |
| Brian Wilson | 30 | San Francisco | 2 | 2.00 | 12 | 16.7% | 16.7% | .500 | 67% | 29% | 0% | 9.00 | 4.13 |
| Justin Hampson | 32 | NY Mets | 13 | 10.00 | 37 | 13.5% | 10.8% | .222 | 64% | 63% | 0% | 1.80 | 3.83 |
| Steven Rodriguez | LA Dodgers | 11 | 6.67 | 26 | 15.4% | 23.1% | .200 | 86% | 47% | 0% | 1.35 | 3.13 | |
| Drew Storen | Washington | 37 | 30.33 | 116 | 6.9% | 20.7% | .272 | 74% | 53% | 0% | 2.37 | 2.44 | |
| Justin De Fratus | 25 | Philadelphia | 13 | 10.67 | 44 | 11.4% | 18.2% | .233 | 58% | 50% | 0% | 3.37 | 3.03 |
| Charles Fick | St. Louis | 2 | 1.67 | 9 | 11.1% | 0.0% | .429 | 75% | 0% | 0% | 5.39 | 4.92 | |
| Rob Scahill | Colorado | 6 | 8.67 | 33 | 9.1% | 12.1% | .269 | 90% | 52% | 0% | 1.04 | 3.24 | |
