| 2012 NL Leaders | |||||||||||||
| Name | Age | Team | G | IP | TBF | BB% | K% | BABIP | LOB% | GB% | HR/Air | ERA | FIP |
| Jeff Francis | 32 | Colorado | 24 | 113.00 | 502 | 4.4% | 15.1% | .358 | 68% | 51% | 8% | 5.58 | 4.30 |
| Vance Worley | 25 | Philadelphia | 23 | 133.00 | 590 | 8.0% | 18.1% | .358 | 73% | 45% | 5% | 4.26 | 3.89 |
| Jaime Garcia | 26 | St. Louis | 20 | 121.67 | 515 | 5.8% | 19.0% | .353 | 69% | 54% | 4% | 3.92 | 3.00 |
| Randy Wolf | 36 | Milwaukee | 25 | 142.33 | 633 | 7.1% | 15.2% | .349 | 68% | 45% | 8% | 5.69 | 4.77 |
| Christopher Volstad | 26 | Chi Cubs | 21 | 111.33 | 507 | 8.5% | 12.0% | .330 | 64% | 51% | 8% | 6.31 | 5.14 |
| Zack Greinke | 29 | Milwaukee | 21 | 123.00 | 504 | 5.6% | 24.2% | .328 | 72% | 54% | 4% | 3.44 | 2.57 |
| Lance Lynn | 25 | St. Louis | 35 | 176.00 | 744 | 8.6% | 24.2% | .328 | 76% | 46% | 6% | 3.78 | 3.53 |
| Jeremy Guthrie | 33 | Colorado | 19 | 90.67 | 422 | 7.3% | 10.7% | .328 | 67% | 43% | 11% | 6.35 | 6.40 |
| Patrick Corbin | Arizona | 22 | 107.00 | 454 | 5.5% | 18.9% | .326 | 71% | 47% | 8% | 4.54 | 4.03 | |
| Adam Wainwright | 31 | St. Louis | 32 | 198.67 | 831 | 6.3% | 22.1% | .325 | 68% | 51% | 5% | 3.94 | 3.13 |
| Michael Fiers | Milwaukee | 23 | 127.67 | 539 | 6.7% | 25.0% | .325 | 73% | 34% | 5% | 3.74 | 3.13 | |
| Jeremy Hefner | NY Mets | 26 | 93.67 | 408 | 4.4% | 15.2% | .325 | 64% | 45% | 5% | 5.09 | 3.69 | |
| J.A. Happ | 30 | Houston | 18 | 104.33 | 457 | 8.5% | 21.4% | .324 | 73% | 46% | 10% | 4.83 | 4.52 |
| Alex White | Colorado | 23 | 98.00 | 459 | 11.1% | 13.9% | .324 | 69% | 54% | 9% | 5.51 | 5.26 | |
| Thomas Hanson | 26 | Atlanta | 31 | 174.67 | 761 | 9.3% | 21.2% | .324 | 74% | 40% | 9% | 4.48 | 4.60 |
| Erik Bedard | 33 | Pittsburgh | 24 | 125.67 | 557 | 10.1% | 21.2% | .322 | 67% | 45% | 7% | 5.01 | 4.11 |
| Tim Lincecum | 28 | San Francisco | 33 | 186.00 | 825 | 10.9% | 23.0% | .321 | 68% | 45% | 8% | 5.18 | 4.21 |
| Stephen Strasburg | Washington | 28 | 159.33 | 653 | 7.4% | 30.2% | .320 | 75% | 43% | 7% | 3.16 | 2.86 | |
| Jake Westbrook | 35 | St. Louis | 28 | 174.67 | 751 | 6.9% | 14.1% | .318 | 71% | 57% | 5% | 3.92 | 3.84 |
| Ian Kennedy | 28 | Arizona | 33 | 208.33 | 899 | 6.1% | 20.8% | .316 | 75% | 38% | 7% | 4.02 | 4.07 |
| Chad Billingsley | 28 | LA Dodgers | 25 | 149.67 | 634 | 7.1% | 20.2% | .316 | 72% | 47% | 5% | 3.55 | 3.37 |
| Mike Leake | Cincinnati | 30 | 179.00 | 757 | 5.4% | 15.3% | .314 | 71% | 49% | 9% | 4.58 | 4.46 | |
| Cliff Lee | 34 | Philadelphia | 30 | 211.00 | 847 | 3.3% | 24.4% | .313 | 79% | 46% | 8% | 3.16 | 3.17 |
| Randall Delgado | 22 | Atlanta | 18 | 92.67 | 401 | 10.5% | 19.0% | .313 | 70% | 50% | 6% | 4.37 | 4.10 |
| Joshua Collmenter | Arizona | 28 | 90.33 | 375 | 5.9% | 21.3% | .312 | 78% | 40% | 8% | 3.69 | 3.96 | |
| Joe Saunders | 31 | Arizona | 21 | 130.00 | 561 | 5.5% | 15.9% | .312 | 72% | 44% | 7% | 4.22 | 4.22 |
| Jordan Lyles | 22 | Houston | 25 | 141.33 | 628 | 6.7% | 15.8% | .310 | 61% | 53% | 9% | 5.09 | 4.56 |
| Joe Kelly | St. Louis | 24 | 107.00 | 457 | 7.9% | 16.4% | .310 | 74% | 52% | 6% | 3.53 | 4.03 | |
| Roy Halladay | 35 | Philadelphia | 25 | 156.33 | 646 | 5.6% | 20.4% | .309 | 69% | 46% | 7% | 4.49 | 3.72 |
| Johan Santana | 33 | NY Mets | 21 | 117.00 | 499 | 7.8% | 22.2% | .308 | 69% | 35% | 8% | 4.85 | 4.12 |
