| SP | Bauer, T.Bauer, Trevor † >> | 27 | 2018 | R | 96 | 31 | 31 | 17 | 9 | 3.55 | .282 | 1.15 | 7.4 | 2.9 | 10.5 | 207.2 | 171 | 84 | 82 | 23 | 67 | 241 | 0 | 0 | 0 | 0 | 18 | 7 | 12 | 3.19 |
| SP | Greinke, Z.Greinke, Zack >> | 35 | 2018 | R | 89 | 30 | 30 | 12 | 10 | 4.42 | .298 | 1.25 | 8.7 | 2.6 | 8.2 | 197.1 | 191 | 104 | 97 | 30 | 56 | 180 | 1 | 0 | 0 | 0 | 17 | 4 | 2 | 4.07 |
| SP | Richards, G.Richards, Garrett >> | 30 | 2018 | R | 73 | 29 | 29 | 12 | 7 | 3.34 | .300 | 1.27 | 7.2 | 4.3 | 11.1 | 148.0 | 118 | 55 | 55 | 12 | 70 | 182 | 1 | 0 | 0 | 1 | 5 | 2 | 17 | 3.05 |
| SP | Keller, B.Keller, Brad # + >> | 22 | 2018 | R | 45 | 28 | 28 | 5 | 10 | 5.93 | .339 | 1.51 | 10.5 | 3.1 | 7.5 | 123.0 | 143 | 81 | 81 | 15 | 43 | 102 | 0 | 0 | 0 | 0 | 3 | 3 | 6 | 4.05 |
| SP | Fillmyer, H.Fillmyer, Heath # + >> | 24 | 2018 | R | 42 | 21 | 20 | 6 | 7 | 5.28 | .338 | 1.47 | 10.0 | 3.2 | 7.7 | 104.0 | 116 | 61 | 61 | 26 | 37 | 89 | 0 | 0 | 0 | 0 | 6 | 6 | 4 | 5.78 |
| RP | Altavilla, D.Altavilla, Dan # + >> | 25 | 2018 | R | 76 | 80 | 0 | 7 | 5 | 5.15 | .331 | 1.43 | 7.3 | 5.7 | 11.7 | 99.2 | 80 | 57 | 57 | 11 | 63 | 129 | 0 | 1 | 6 | 0 | 0 | 5 | 14 | 3.90 |
| RP | Hudson, D.Hudson, Daniel >> | 31 | 2018 | R | 71 | 64 | 0 | 4 | 3 | 4.25 | .297 | 1.27 | 7.5 | 4.1 | 8.1 | 82.2 | 68 | 40 | 39 | 10 | 37 | 74 | 0 | 4 | 3 | 0 | 0 | 0 | 7 | 4.13 |
| RP | Freeman, S.Freeman, Sam >> | 31 | 2018 | L | 52 | 60 | 0 | 3 | 4 | 3.38 | .351 | 1.56 | 8.3 | 5.8 | 11.7 | 64.0 | 59 | 26 | 24 | 6 | 41 | 83 | 0 | 8 | 2 | 0 | 0 | 4 | 1 | 3.73 |
| RP | Soria, J.Soria, Joakim >> | 34 | 2018 | R | 78 | 43 | 0 | 3 | 0 | 3.61 | .314 | 1.37 | 9.4 | 3.0 | 10.5 | 42.1 | 44 | 17 | 17 | 6 | 14 | 49 | 0 | 6 | 0 | 0 | 0 | 0 | 0 | 3.52 |
| RP | Arano, V.Arano, Victor + >> | 23 | 2018 | R | 67 | 30 | 0 | 1 | 2 | 3.03 | .272 | 1.09 | 8.7 | 1.3 | 8.5 | 35.2 | 34 | 12 | 12 | 2 | 5 | 33 | 0 | 2 | 0 | 0 | 0 | 1 | 1 | 2.37 |
| RP | Herrera, K.Herrera, Kelvin >> | 28 | 2018 | R | 59 | 32 | 0 | 1 | 0 | 6.25 | .354 | 1.61 | 11.9 | 2.9 | 9.3 | 31.2 | 41 | 24 | 22 | 8 | 10 | 32 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 5.35 |