| RP | Bracho, S.Bracho, Silvino >> | 25 | 2018 | R | 70 | 104 | 0 | 4 | 1 | 2.07 | .203 | 0.74 | 4.6 | 2.1 | 10.9 | 91.1 | 47 | 22 | 21 | 5 | 21 | 110 | 0 | 6 | 1 | 0 | 0 | 2 | 4 | 2.05 |
| RP | Hirano, Y.Hirano, Yoshihisa >> | 34 | 2018 | R | 76 | 82 | 0 | 2 | 2 | 2.95 | .270 | 1.09 | 6.2 | 3.7 | 8.9 | 64.0 | 44 | 23 | 21 | 4 | 26 | 63 | 0 | 4 | 1 | 0 | 0 | 1 | 5 | 3.11 |
| RP | McFarland, T.McFarland, T.J. >> | 29 | 2018 | L | 55 | 102 | 0 | 2 | 1 | 3.98 | .291 | 1.22 | 7.3 | 3.7 | 8.9 | 63.1 | 51 | 30 | 28 | 9 | 26 | 62 | 0 | 2 | 0 | 0 | 0 | 1 | 1 | 4.17 |
| SP | Greinke, Z.Greinke, Zack >> | 35 | 2018 | R | 81 | 37 | 37 | 16 | 13 | 3.23 | .285 | 1.17 | 8.1 | 2.5 | 8.0 | 256.1 | 229 | 108 | 92 | 26 | 70 | 227 | 3 | 0 | 0 | 1 | 0 | 7 | 3 | 3.45 |
| RP | Bradley, A.Bradley, Archie >> | 25 | 2018 | R | 67 | 77 | 0 | 2 | 0 | 2.05 | .201 | 0.68 | 4.7 | 1.4 | 11.7 | 57.0 | 30 | 15 | 13 | 6 | 9 | 74 | 0 | 8 | 3 | 0 | 0 | 4 | 1 | 2.46 |
| RP | Salas, F.Salas, Fernando >> | 33 | 2018 | R | 37 | 51 | 0 | 1 | 2 | 1.72 | .241 | 0.95 | 6.3 | 2.5 | 8.5 | 36.2 | 25 | 7 | 7 | 1 | 10 | 34 | 0 | 7 | 3 | 0 | 0 | 0 | 4 | 2.31 |
| RP | Boxberger, B.Boxberger, Brad >> | 30 | 2018 | R | 52 | 27 | 0 | 3 | 3 | 3.67 | .331 | 1.44 | 7.3 | 5.7 | 10.7 | 27.0 | 22 | 12 | 11 | 1 | 17 | 32 | 0 | 7 | 1 | 0 | 0 | 1 | 0 | 3.11 |
| RP | Chafin, A.Chafin, Andrew >> | 28 | 2018 | L | 53 | 89 | 0 | 0 | 3 | 3.16 | .255 | 0.97 | 5.4 | 3.4 | 11.4 | 37.0 | 22 | 16 | 13 | 2 | 14 | 47 | 0 | 4 | 1 | 0 | 0 | 2 | 0 | 2.46 |
| SP | Godley, Z.Godley, Zack >> | 28 | 2018 | R | 34 | 30 | 29 | 13 | 10 | 3.34 | .301 | 1.25 | 7.2 | 4.1 | 11.3 | 172.2 | 137 | 72 | 64 | 13 | 79 | 215 | 1 | 0 | 0 | 1 | 0 | 7 | 6 | 2.98 |
| RP | Ziegler, B.Ziegler, Brad >> | 39 | 2018 | R | 39 | 27 | 0 | 3 | 4 | 3.62 | .328 | 1.46 | 9.3 | 4.0 | 9.3 | 27.1 | 28 | 12 | 11 | 4 | 12 | 28 | 0 | 3 | 1 | 0 | 0 | 0 | 2 | 4.19 |
| RP | Andriese, M.Andriese, Matt >> | 28 | 2018 | R | 32 | 22 | 0 | 2 | 1 | 1.80 | .308 | 1.33 | 8.4 | 3.6 | 10.8 | 15.0 | 14 | 5 | 3 | 2 | 6 | 18 | 0 | 1 | 2 | 0 | 0 | 0 | 0 | 3.53 |
| SP | Buchholz, C.Buchholz, Clay >> | 34 | 2018 | R | 85 | 31 | 31 | 11 | 11 | 2.72 | .263 | 1.05 | 7.4 | 2.1 | 8.1 | 228.0 | 187 | 81 | 69 | 19 | 53 | 206 | 3 | 0 | 0 | 0 | 0 | 4 | 2 | 3.03 |
| RP | De La Rosa, J.De La Rosa, Jorge >> | 37 | 2018 | L | 40 | 72 | 0 | 2 | 2 | 2.86 | .288 | 1.18 | 7.7 | 3.2 | 7.7 | 34.2 | 29 | 11 | 11 | 4 | 12 | 29 | 0 | 3 | 1 | 0 | 0 | 1 | 0 | 3.97 |
| RP | Diekman, J.Diekman, Jake >> | 31 | 2018 | L | 39 | 56 | 0 | 2 | 1 | 3.47 | .331 | 1.43 | 9.8 | 3.3 | 8.5 | 36.1 | 39 | 18 | 14 | 4 | 13 | 34 | 0 | 1 | 1 | 0 | 0 | 2 | 4 | 3.81 |