| 2012 NL Leaders | |||||||||||||
| Name | Age | Team | G | IP | TBF | BB% | K% | BABIP | LOB% | GB% | HR/Air | ERA | FIP |
| Joseph Paterson | Arizona | 6 | 2.67 | 26 | 11.5% | 0.0% | .619 | 46% | 57% | 20% | 37.08 | 16.24 | |
| Edwar Cabrera | 25 | Colorado | 2 | 5.67 | 33 | 21.2% | 15.2% | .353 | 59% | 43% | 26% | 11.11 | 11.95 |
| Brian Sanches | 34 | Philadelphia | 6 | 6.33 | 34 | 8.8% | 14.7% | .381 | 85% | 28% | 22% | 9.95 | 11.18 |
| Matt Palmer | 33 | San Diego | 3 | 2.00 | 10 | 20.0% | 20.0% | .250 | 77% | 33% | 25% | 9.00 | 10.63 |
| Todd Redmond | 27 | Cincinnati | 1 | 3.33 | 22 | 22.7% | 9.1% | .429 | 75% | 33% | 10% | 10.81 | 10.33 |
| Blake Parker | 27 | Chi Cubs | 7 | 6.00 | 32 | 15.6% | 18.8% | .412 | 74% | 40% | 25% | 6.00 | 10.13 |
| Christopher Schwinden | 26 | NY Mets | 3 | 8.67 | 46 | 6.5% | 2.2% | .297 | 40% | 50% | 19% | 12.46 | 9.93 |
| D.J. Carrasco | NY Mets | 4 | 3.67 | 18 | 0.0% | 16.7% | .333 | 95% | 38% | 23% | 7.36 | 9.39 | |
| Bill Bray | 29 | Cincinnati | 14 | 8.67 | 43 | 32.6% | 16.3% | .222 | 87% | 30% | 13% | 5.19 | 9.36 |
| Francisco Cordero | 37 | Houston | 6 | 5.00 | 32 | 12.5% | 15.6% | .579 | 46% | 41% | 16% | 19.80 | 9.33 |
| Jorge De La Rosa | 31 | Colorado | 3 | 10.67 | 53 | 3.8% | 11.3% | .308 | 42% | 34% | 17% | 9.28 | 8.66 |
| J.C. Romero | 36 | St. Louis | 11 | 8.00 | 41 | 4.9% | 12.2% | .367 | 62% | 50% | 18% | 10.13 | 7.88 |
| Juan Perez | 34 | Milwaukee | 10 | 7.00 | 35 | 22.9% | 28.6% | .308 | 90% | 47% | 25% | 5.14 | 7.84 |
| Armando Galarraga | 30 | Houston | 5 | 24.00 | 120 | 15.0% | 14.2% | .311 | 71% | 40% | 12% | 7.13 | 7.46 |
| Jonathan Sanchez | 30 | Colorado | 3 | 11.33 | 57 | 15.8% | 15.8% | .424 | 60% | 34% | 12% | 9.53 | 7.36 |
| Tyler Thornburg | Milwaukee | 8 | 22.00 | 95 | 7.4% | 21.1% | .276 | 101% | 44% | 21% | 4.50 | 7.13 | |
| Jonathan Albaladejo | 30 | Arizona | 3 | 3.00 | 15 | 0.0% | 13.3% | .400 | 65% | 25% | 11% | 9.00 | 7.13 |
| Takashi Saito | 42 | Arizona | 16 | 12.00 | 60 | 8.3% | 18.3% | .351 | 52% | 41% | 16% | 6.75 | 7.13 |
| Jeff Beliveau | Chi Cubs | 22 | 17.67 | 86 | 14.0% | 19.8% | .327 | 93% | 41% | 15% | 4.58 | 7.09 | |
| Kerry Wood | 35 | Chi Cubs | 10 | 8.67 | 42 | 26.2% | 14.3% | .304 | 62% | 42% | 7% | 8.30 | 7.05 |
| Brooks Raley | Chi Cubs | 5 | 24.33 | 116 | 9.5% | 13.8% | .321 | 61% | 43% | 14% | 8.14 | 6.91 | |
| Maikel Cleto | 23 | St. Louis | 9 | 9.00 | 41 | 4.9% | 36.6% | .474 | 87% | 32% | 26% | 7.00 | 6.57 |
| Kyle Weiland | Houston | 3 | 17.67 | 79 | 8.9% | 16.5% | .352 | 75% | 43% | 15% | 6.62 | 6.52 | |
| John Ely | LA Dodgers | 2 | 2.67 | 19 | 21.1% | 15.8% | .750 | 45% | 55% | 0% | 20.22 | 6.50 | |
| Aneury Rodriguez | 25 | Houston | 1 | 6.00 | 22 | 9.1% | 27.3% | .0 | 167% | 21% | 18% | 3.00 | 6.46 |
| Jeremy Guthrie | 33 | Colorado | 19 | 90.67 | 422 | 7.3% | 10.7% | .328 | 67% | 43% | 11% | 6.35 | 6.40 |
| Charles Fick | Houston | 18 | 23.00 | 107 | 15.9% | 15.9% | .339 | 80% | 47% | 11% | 4.30 | 6.39 | |
| Ryan Perry | Washington | 7 | 8.00 | 35 | 5.7% | 8.6% | .357 | 45% | 37% | 11% | 10.13 | 6.38 | |
| Matt Guerrier | 34 | LA Dodgers | 16 | 14.00 | 56 | 12.5% | 16.1% | .152 | 85% | 37% | 13% | 3.86 | 6.34 |
| Brian Fuentes | 37 | St. Louis | 6 | 5.00 | 26 | 19.2% | 23.1% | .385 | 62% | 40% | 11% | 9.00 | 6.33 |
