| 2012 NL Leaders | |||||||||||||||||
| Name | Age | Team | G | W | L | IP | TBF | H | 2B | 3B | HR | R | ER | BB | SO | ERA | RA9 |
| Jeremy Guthrie | 33 | Colorado | 19 | 3 | 9 | 90.2 | 422 | 122 | 36 | 1 | 21 | 72 | 64 | 31 | 45 | 6.35 | 7.15 |
| Christopher Volstad | 26 | Chi Cubs | 21 | 3 | 12 | 111.1 | 507 | 137 | 21 | 5 | 16 | 81 | 78 | 43 | 61 | 6.31 | 6.55 |
| Randy Wolf | 36 | Milwaukee | 25 | 3 | 10 | 142.1 | 633 | 179 | 38 | 6 | 21 | 94 | 90 | 45 | 96 | 5.69 | 5.94 |
| Jeff Francis | 32 | Colorado | 24 | 6 | 7 | 113.0 | 502 | 145 | 29 | 3 | 15 | 71 | 70 | 22 | 76 | 5.58 | 5.65 |
| Alex White | Colorado | 23 | 2 | 9 | 98.0 | 459 | 114 | 25 | 6 | 13 | 66 | 60 | 51 | 64 | 5.51 | 6.06 | |
| Tim Lincecum | 28 | San Francisco | 33 | 10 | 15 | 186.0 | 825 | 183 | 42 | 5 | 23 | 111 | 107 | 90 | 190 | 5.18 | 5.37 |
| Jeremy Hefner | NY Mets | 26 | 4 | 7 | 93.2 | 408 | 110 | 28 | 3 | 9 | 55 | 53 | 18 | 62 | 5.09 | 5.28 | |
| Jordan Lyles | 22 | Houston | 25 | 5 | 12 | 141.1 | 628 | 159 | 26 | 3 | 20 | 97 | 80 | 42 | 99 | 5.09 | 6.18 |
| Erik Bedard | 33 | Pittsburgh | 24 | 7 | 14 | 125.2 | 557 | 129 | 28 | 3 | 14 | 76 | 70 | 56 | 118 | 5.01 | 5.44 |
| Drew Pomeranz | Colorado | 22 | 2 | 9 | 96.2 | 434 | 97 | 17 | 2 | 14 | 57 | 53 | 46 | 83 | 4.93 | 5.31 | |
| Johan Santana | 33 | NY Mets | 21 | 6 | 9 | 117.0 | 499 | 117 | 27 | 1 | 17 | 65 | 63 | 39 | 111 | 4.85 | 5.00 |
| J.A. Happ | 30 | Houston | 18 | 7 | 9 | 104.1 | 457 | 112 | 25 | 4 | 17 | 58 | 56 | 39 | 98 | 4.83 | 5.00 |
| Anthony Bass | San Diego | 24 | 2 | 8 | 97.0 | 411 | 89 | 23 | 3 | 10 | 59 | 51 | 39 | 80 | 4.73 | 5.47 | |
| Bud Norris | 27 | Houston | 29 | 7 | 13 | 168.1 | 733 | 165 | 37 | 2 | 23 | 90 | 88 | 66 | 165 | 4.71 | 4.81 |
| Joe Blanton | 32 | Philadelphia | 21 | 8 | 9 | 133.1 | 560 | 141 | 28 | 4 | 22 | 74 | 68 | 18 | 115 | 4.59 | 5.00 |
| Mike Leake | Cincinnati | 30 | 8 | 9 | 179.0 | 757 | 200 | 46 | 5 | 26 | 97 | 91 | 41 | 116 | 4.58 | 4.88 | |
| Patrick Corbin | Arizona | 22 | 6 | 8 | 107.0 | 454 | 117 | 23 | 5 | 14 | 56 | 54 | 25 | 86 | 4.54 | 4.71 | |
| Roy Halladay | 35 | Philadelphia | 25 | 11 | 8 | 156.1 | 646 | 155 | 27 | 3 | 18 | 78 | 78 | 36 | 132 | 4.49 | 4.49 |
| Thomas Hanson | 26 | Atlanta | 31 | 13 | 10 | 174.2 | 761 | 183 | 45 | 2 | 27 | 95 | 87 | 71 | 161 | 4.48 | 4.89 |
| Randall Delgado | 22 | Atlanta | 18 | 4 | 9 | 92.2 | 401 | 89 | 21 | 0 | 8 | 48 | 45 | 42 | 76 | 4.37 | 4.66 |
| Travis Wood | 25 | Chi Cubs | 26 | 6 | 13 | 156.0 | 649 | 133 | 39 | 3 | 25 | 80 | 74 | 54 | 119 | 4.27 | 4.62 |
| Vance Worley | 25 | Philadelphia | 23 | 6 | 9 | 133.0 | 590 | 155 | 35 | 4 | 12 | 69 | 63 | 47 | 107 | 4.26 | 4.67 |
| Joe Saunders | 31 | Arizona | 21 | 6 | 10 | 130.0 | 561 | 146 | 29 | 3 | 17 | 68 | 61 | 31 | 89 | 4.22 | 4.71 |
| Kevin Correia | 32 | Pittsburgh | 32 | 12 | 11 | 171.0 | 728 | 176 | 29 | 5 | 20 | 89 | 80 | 46 | 89 | 4.21 | 4.68 |
| James McDonald | 28 | Pittsburgh | 30 | 12 | 8 | 171.0 | 713 | 147 | 35 | 5 | 21 | 85 | 80 | 69 | 151 | 4.21 | 4.47 |
| Barry Zito | 34 | San Francisco | 32 | 15 | 8 | 184.1 | 799 | 186 | 43 | 6 | 20 | 91 | 85 | 70 | 114 | 4.15 | 4.44 |
| Chris Young | 33 | NY Mets | 20 | 4 | 9 | 115.0 | 493 | 119 | 30 | 3 | 16 | 58 | 53 | 36 | 80 | 4.15 | 4.54 |
| Mike Minor | Atlanta | 30 | 11 | 10 | 179.1 | 728 | 151 | 30 | 3 | 26 | 88 | 82 | 56 | 145 | 4.12 | 4.42 | |
| Dillon Gee | NY Mets | 17 | 6 | 7 | 109.2 | 463 | 108 | 17 | 1 | 12 | 56 | 50 | 29 | 97 | 4.10 | 4.60 | |
| Edinson Volquez | 29 | San Diego | 32 | 11 | 11 | 182.2 | 802 | 160 | 35 | 4 | 14 | 88 | 83 | 105 | 174 | 4.09 | 4.34 |
