| SP | Clemens, R.Clemens, Roger >> | 27 | 1989 | R | 73 | 35 | 35 | 15 | 11 | 4.27 | .321 | 1.40 | 8.5 | 4.1 | 5.7 | 225.1 | 212 | 108 | 107 | 16 | 103 | 143 | 0 | 0 | 0 | 0 | 21 | 4 | 7 | 4.08 |
| SP | Hershiser, O.Hershiser, Orel >> | 31 | 1989 | R | 70 | 33 | 33 | 10 | 11 | 5.03 | .347 | 1.58 | 10.3 | 3.9 | 4.7 | 220.0 | 252 | 130 | 123 | 16 | 95 | 115 | 5 | 0 | 0 | 1 | 15 | 3 | 3 | 4.24 |
| SP | Sutcliffe, R.Sutcliffe, Rick >> | 33 | 1989 | R | 71 | 31 | 31 | 14 | 11 | 4.13 | .319 | 1.39 | 8.5 | 4.0 | 5.4 | 200.1 | 189 | 99 | 92 | 12 | 89 | 119 | 1 | 0 | 0 | 0 | 16 | 3 | 6 | 3.97 |
| RP | Lancaster, L.Lancaster, Les >> | 27 | 1989 | R | 77 | 99 | 0 | 8 | 3 | 4.62 | .325 | 1.44 | 9.6 | 3.4 | 5.9 | 138.1 | 147 | 79 | 71 | 12 | 52 | 90 | 0 | 6 | 2 | 0 | 0 | 1 | 5 | 3.98 |
| RP | Reardon, J.Reardon, Jeff >> | 34 | 1989 | R | 61 | 60 | 0 | 7 | 2 | 3.84 | .278 | 1.14 | 8.4 | 2.0 | 4.6 | 72.2 | 67 | 32 | 31 | 5 | 16 | 37 | 0 | 3 | 1 | 0 | 0 | 1 | 0 | 3.58 |
| SP | Reuschel, R.Reuschel, Rick >> | 40 | 1989 | R | 56 | 7 | 0 | 0 | 1 | 6.75 | .397 | 1.98 | 17.4 | 1.3 | 4.5 | 14.2 | 27 | 14 | 11 | 3 | 2 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5.21 |