| 2012 NL Leaders | |||||||||||||||||
| Name | Age | Team | G | W | L | IP | TBF | H | 2B | 3B | HR | R | ER | BB | SO | ERA | RA9 |
| Kristopher Medlen | 27 | Atlanta | 50 | 10 | 1 | 138.0 | 520 | 103 | 17 | 2 | 6 | 26 | 24 | 23 | 120 | 1.57 | 1.70 |
| Jaime Garcia | 26 | St. Louis | 20 | 7 | 7 | 121.2 | 515 | 136 | 26 | 3 | 7 | 58 | 53 | 30 | 98 | 3.92 | 4.29 |
| Eric Stults | 33 | San Diego | 18 | 8 | 3 | 92.1 | 383 | 86 | 15 | 4 | 7 | 36 | 33 | 23 | 51 | 3.22 | 3.51 |
| Zack Greinke | 29 | Milwaukee | 21 | 9 | 3 | 123.0 | 504 | 120 | 20 | 4 | 7 | 49 | 47 | 28 | 122 | 3.44 | 3.59 |
| Randall Delgado | 22 | Atlanta | 18 | 4 | 9 | 92.2 | 401 | 89 | 21 | 0 | 8 | 48 | 45 | 42 | 76 | 4.37 | 4.66 |
| Jeff Karstens | 30 | Pittsburgh | 19 | 5 | 4 | 90.2 | 372 | 89 | 17 | 1 | 8 | 41 | 40 | 15 | 66 | 3.97 | 4.07 |
| Jeremy Hefner | NY Mets | 26 | 4 | 7 | 93.2 | 408 | 110 | 28 | 3 | 9 | 55 | 53 | 18 | 62 | 5.09 | 5.28 | |
| Ryan Dempster | 35 | Chi Cubs | 16 | 5 | 5 | 104.0 | 417 | 80 | 13 | 2 | 9 | 28 | 26 | 27 | 83 | 2.25 | 2.42 |
| Gio Gonzalez | 27 | Washington | 32 | 21 | 8 | 199.1 | 822 | 149 | 35 | 3 | 9 | 69 | 64 | 76 | 207 | 2.89 | 3.12 |
| Joe Kelly | St. Louis | 24 | 5 | 7 | 107.0 | 457 | 111 | 20 | 3 | 10 | 50 | 42 | 36 | 75 | 3.53 | 4.21 | |
| Anthony Bass | San Diego | 24 | 2 | 8 | 97.0 | 411 | 89 | 23 | 3 | 10 | 59 | 51 | 39 | 80 | 4.73 | 5.47 | |
| Chad Billingsley | 28 | LA Dodgers | 25 | 10 | 9 | 149.2 | 634 | 148 | 37 | 9 | 11 | 66 | 59 | 45 | 128 | 3.55 | 3.97 |
| Jake Westbrook | 35 | St. Louis | 28 | 13 | 11 | 174.2 | 751 | 190 | 32 | 3 | 12 | 85 | 76 | 52 | 106 | 3.92 | 4.38 |
| Tim Hudson | 37 | Atlanta | 28 | 16 | 7 | 179.0 | 749 | 169 | 29 | 6 | 12 | 77 | 72 | 48 | 102 | 3.62 | 3.87 |
| Paul Maholm | 30 | Chi Cubs | 21 | 9 | 6 | 120.1 | 503 | 115 | 22 | 4 | 12 | 51 | 50 | 34 | 81 | 3.74 | 3.81 |
| Vance Worley | 25 | Philadelphia | 23 | 6 | 9 | 133.0 | 590 | 155 | 35 | 4 | 12 | 69 | 63 | 47 | 107 | 4.26 | 4.67 |
| Michael Fiers | Milwaukee | 23 | 9 | 10 | 127.2 | 539 | 125 | 29 | 1 | 12 | 56 | 53 | 36 | 135 | 3.74 | 3.95 | |
| Dillon Gee | NY Mets | 17 | 6 | 7 | 109.2 | 463 | 108 | 17 | 1 | 12 | 56 | 50 | 29 | 97 | 4.10 | 4.60 | |
| Joshua Collmenter | Arizona | 28 | 5 | 3 | 90.1 | 375 | 92 | 18 | 1 | 13 | 39 | 37 | 22 | 80 | 3.69 | 3.89 | |
| Lucas Harrell | 27 | Houston | 32 | 11 | 11 | 193.2 | 827 | 185 | 27 | 7 | 13 | 90 | 81 | 78 | 140 | 3.76 | 4.18 |
| Alex White | Colorado | 23 | 2 | 9 | 98.0 | 459 | 114 | 25 | 6 | 13 | 66 | 60 | 51 | 64 | 5.51 | 6.06 | |
| Wandy Rodriguez | 34 | Houston | 21 | 7 | 9 | 130.2 | 558 | 134 | 32 | 2 | 13 | 66 | 55 | 32 | 89 | 3.79 | 4.55 |
| Edinson Volquez | 29 | San Diego | 32 | 11 | 11 | 182.2 | 802 | 160 | 35 | 4 | 14 | 88 | 83 | 105 | 174 | 4.09 | 4.34 |
| Aaron Harang | 34 | LA Dodgers | 31 | 10 | 10 | 179.2 | 786 | 167 | 42 | 4 | 14 | 85 | 75 | 85 | 131 | 3.76 | 4.26 |
| Jason Marquis | 34 | San Diego | 15 | 8 | 11 | 93.2 | 401 | 94 | 21 | 3 | 14 | 53 | 42 | 28 | 79 | 4.04 | 5.09 |
| Drew Pomeranz | Colorado | 22 | 2 | 9 | 96.2 | 434 | 97 | 17 | 2 | 14 | 57 | 53 | 46 | 83 | 4.93 | 5.31 | |
| Patrick Corbin | Arizona | 22 | 6 | 8 | 107.0 | 454 | 117 | 23 | 5 | 14 | 56 | 54 | 25 | 86 | 4.54 | 4.71 | |
| Wade Miley | Arizona | 32 | 16 | 11 | 194.2 | 807 | 193 | 46 | 9 | 14 | 79 | 72 | 37 | 144 | 3.33 | 3.65 | |
| Erik Bedard | 33 | Pittsburgh | 24 | 7 | 14 | 125.2 | 557 | 129 | 28 | 3 | 14 | 76 | 70 | 56 | 118 | 5.01 | 5.44 |
| Matt Garza | 29 | Chi Cubs | 18 | 5 | 7 | 103.2 | 424 | 90 | 11 | 2 | 15 | 48 | 45 | 32 | 96 | 3.91 | 4.17 |
