J.J. Putz had the best ERA for the Diamondbacks with 50.0+ innings pitched in 2011, with an ERA of 2.17.
| NAME | ERA | IP | SEASON | TM | G | W | L | W% | GS | SO | CG | SHO | SV | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | K/9 | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | ERA- | FIP | FIP- | H/9 | PRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | J.J. Putz | 2.17 | 58.0 | 2011 |  ARI | 60 | 2 | 2 | .500 | 0 | 61 | 0 | 0 | 45 | 41 | 14 | 15 | 4 | 12 | 2 | 52 | 0 | 229 | 2 | 9.47 | 1.86 | 5.08 | 0.62 | 26.6 | 5.2 | 0.91 | .247 | 2.33 | 55 | 2.54 | 65 | 6.36 | 8.6 |
| 2 | | I. Kennedy | 2.88 | 222.0 | 2011 | ARI | 33 | 21 | 4 | .840 | 33 | 198 | 1 | 1 | 0 | 186 | 71 | 73 | 19 | 55 | 9 | 0 | 0 | 900 | 11 | 8.03 | 2.23 | 3.60 | 0.77 | 22.0 | 6.1 | 1.09 | .270 | 2.96 | 73 | 3.21 | 83 | 7.54 | 16.5 |
| 3 | | D. Hernandez | 3.38 | 69.1 | 2011 | ARI | 74 | 5 | 3 | .625 | 0 | 77 | 0 | 0 | 11 | 49 | 26 | 27 | 4 | 30 | 2 | 28 | 1 | 291 | 7 | 10.00 | 3.89 | 2.57 | 0.52 | 26.5 | 10.3 | 1.14 | .253 | 3.50 | 85 | 2.93 | 76 | 6.36 | 7.3 |
| 4 | | J. Collmenter | 3.38 | 154.1 | 2011 | ARI | 31 | 10 | 10 | .500 | 24 | 100 | 0 | 0 | 0 | 137 | 58 | 61 | 17 | 28 | 5 | 3 | 2 | 621 | 1 | 5.83 | 1.63 | 3.57 | 0.99 | 16.1 | 4.5 | 1.07 | .255 | 3.56 | 85 | 3.80 | 98 | 7.99 | 1.5 |
| 5 | | D. Hudson | 3.49 | 222.0 | 2011 | ARI | 33 | 16 | 12 | .571 | 33 | 169 | 3 | 0 | 0 | 217 | 86 | 98 | 17 | 50 | 8 | 0 | 1 | 921 | 4 | 6.85 | 2.03 | 3.38 | 0.69 | 18.3 | 5.4 | 1.20 | .295 | 3.97 | 88 | 3.27 | 84 | 8.80 | 14.9 |
| 6 | | M. Owings | 3.57 | 63.0 | 2011 | ARI | 33 | 8 | 0 | 1.000 | 4 | 44 | 0 | 0 | 0 | 56 | 25 | 27 | 8 | 23 | 2 | 2 | 0 | 263 | 3 | 6.29 | 3.29 | 1.91 | 1.14 | 16.7 | 8.7 | 1.25 | .258 | 3.86 | 90 | 4.46 | 115 | 8.00 | -4 |
| 7 | | J. Saunders | 3.69 | 212.0 | 2011 | ARI | 33 | 12 | 13 | .480 | 33 | 108 | 1 | 0 | 0 | 210 | 87 | 94 | 29 | 67 | 3 | 0 | 4 | 874 | 3 | 4.58 | 2.84 | 1.61 | 1.23 | 12.4 | 7.7 | 1.31 | .271 | 3.99 | 93 | 4.77 | 123 | 8.92 | -20.6 |
| 8 | | Z. Duke | 4.93 | 76.2 | 2011 | ARI | 21 | 3 | 4 | .429 | 9 | 32 | 0 | 0 | 1 | 101 | 42 | 42 | 6 | 19 | 1 | 5 | 0 | 338 | 1 | 3.76 | 2.23 | 1.68 | 0.70 | 9.5 | 5.6 | 1.57 | .339 | 4.93 | 124 | 3.98 | 103 | 11.86 | -0.8 |
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