| SP | Martinez, P.Martinez, Pedro >> | 29 | 2000 | R | 100 | 18 | 18 | 4 | 6 | 3.92 | .301 | 1.25 | 8.2 | 3.0 | 9.5 | 117.0 | 107 | 53 | 51 | 8 | 39 | 123 | 3 | 0 | 0 | 1 | 10 | 5 | 3 | 2.91 |
| SP | Alexander, P.Alexander, Pete # >> | 28 | 1915 | R | 88 | 17 | 17 | 6 | 4 | 4.93 | .330 | 1.45 | 10.2 | 2.9 | 5.1 | 104.0 | 118 | 63 | 57 | 17 | 33 | 59 | 2 | 0 | 0 | 0 | 7 | 3 | 0 | 5.03 |
| SP | Cueto, J.Cueto, Johnny >> | 28 | 2014 | R | 75 | 17 | 16 | 4 | 6 | 4.59 | .350 | 1.60 | 10.6 | 3.9 | 5.7 | 98.0 | 115 | 50 | 50 | 16 | 42 | 62 | 0 | 0 | 0 | 0 | 9 | 1 | 1 | 5.17 |
| CL | Doolittle, S.Doolittle, Sean >> | 31 | 2018 | L | 99 | 46 | 0 | 5 | 5 | 6.45 | .343 | 1.48 | 9.2 | 4.3 | 11.5 | 44.2 | 45 | 33 | 32 | 9 | 21 | 56 | 0 | 10 | 6 | 0 | 0 | 4 | 1 | 4.82 |
| SU | Papelbon, J.Papelbon, Jonathan >> | 27 | 2007 | R | 92 | 46 | 0 | 2 | 2 | 3.08 | .273 | 1.11 | 7.3 | 2.8 | 8.6 | 49.2 | 40 | 20 | 17 | 4 | 15 | 47 | 0 | 3 | 4 | 0 | 0 | 1 | 0 | 3.12 |
| RP | Gossage, R.Gossage, Rich >> | 30 | 1981 | R | 90 | 47 | 0 | 7 | 1 | 2.93 | .284 | 1.17 | 6.2 | 4.4 | 7.5 | 61.1 | 42 | 21 | 20 | 3 | 30 | 51 | 0 | 0 | 3 | 0 | 0 | 1 | 1 | 3.49 |
| RP | Gallegos, G.Gallegos, Giovanny >> | 27 | 2019 | R | 82 | 35 | 0 | 2 | 1 | 4.93 | .354 | 1.64 | 10.1 | 5.0 | 7.1 | 34.2 | 38 | 23 | 19 | 4 | 19 | 27 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 4.62 |
| RP | Treinen, B.Treinen, Blake >> | 30 | 2018 | R | 79 | 33 | 0 | 2 | 2 | 4.40 | .322 | 1.43 | 9.4 | 3.4 | 8.6 | 47.0 | 49 | 24 | 23 | 4 | 18 | 45 | 0 | 3 | 1 | 0 | 0 | 0 | 1 | 3.34 |