| SP | Buchholz, C.Buchholz, Clay >> | 29 | 2013 | R | 100 | 12 | 1 | 1.74 | .249 | .290 | 1.03 | 6.3 | 3.0 | 8.0 | 108 | 75 | 4 | 36 | 96 | 1 | 0 | 1 | 119 | +4.43 | C |
| SP | Peavy, J.Peavy, Jake >> | 32 | 2013 | R | 89 | 12 | 5 | 4.17 | .273 | .310 | 1.15 | 8.1 | 2.3 | 7.6 | 144 | 130 | 20 | 36 | 121 | 2 | 0 | 0 | 110 | +1.39 | C |
| SP | Lackey, J.Lackey, John >> | 35 | 2013 | R | 83 | 10 | 13 | 3.52 | .275 | .310 | 1.16 | 8.5 | 1.9 | 7.7 | 189 | 179 | 26 | 40 | 161 | 2 | 0 | 4 | 115 | +2.99 | C |
| SP | Lester, J.Lester, Jon >> | 29 | 2013 | L | 62 | 15 | 8 | 3.75 | .298 | .330 | 1.30 | 8.8 | 2.8 | 7.5 | 213 | 209 | 19 | 67 | 177 | 1 | 0 | 5 | 114 | +3.02 | C |
| SP | Doubront, F.Doubront, Felix >> | 25 | 2013 | L | 43 | 11 | 6 | 4.32 | .319 | .350 | 1.43 | 8.9 | 3.9 | 7.7 | 162 | 161 | 13 | 71 | 139 | 0 | 0 | 8 | 99 | +0.88 | C |
| RP | Uehara, K.Uehara, Koji >> | 38 | 2013 | R | 100 | 4 | 1 | 1.09 | .153 | .190 | 0.57 | 4.0 | 1.1 | 12.3 | 74 | 33 | 5 | 9 | 101 | 0 | 21 | 1 | 23 | +3.63 | C |
| RP | Bailey, A.Bailey, Andrew >> | 29 | 2013 | R | 78 | 3 | 1 | 3.77 | .271 | .320 | 1.25 | 7.4 | 3.9 | 12.5 | 28 | 23 | 7 | 12 | 39 | 0 | 8 | 0 | 23 | +0.34 | C |
| RP | Breslow, C.Breslow, Craig >> | 33 | 2013 | L | 75 | 5 | 2 | 1.81 | .264 | .310 | 1.14 | 7.5 | 2.7 | 5.0 | 59 | 49 | 3 | 18 | 33 | 0 | 0 | 2 | 23 | +1.63 | C |
| RP | Tazawa, J.Tazawa, Junichi >> | 27 | 2013 | R | 68 | 5 | 4 | 3.16 | .277 | .320 | 1.21 | 9.3 | 1.6 | 9.5 | 68 | 70 | 9 | 12 | 72 | 0 | 0 | 3 | 23 | +1.07 | C |
| RP | Miller, A.Miller, Andrew >> | 28 | 2013 | L | 63 | 1 | 2 | 2.64 | .296 | .350 | 1.40 | 7.5 | 5.1 | 14.4 | 30 | 25 | 3 | 17 | 48 | 0 | 0 | 2 | 23 | +0.42 | C |
| RP | Britton, D.Britton, Drake >> | 24 | 2013 | L | 54 | 1 | 1 | 3.86 | .277 | .340 | 1.33 | 9.0 | 3.0 | 7.3 | 21 | 21 | 1 | 7 | 17 | 0 | 0 | 0 | 24 | +0.16 | C |
| RP | Workman, B.Workman, Brandon >> | 24 | 2013 | R | 40 | 6 | 3 | 4.97 | .307 | .350 | 1.44 | 9.7 | 3.3 | 10.3 | 41 | 44 | 5 | 15 | 47 | 0 | 0 | 1 | 39 | -0.08 | C |
| RP | De La Torre, J.De La Torre, Jose >> | 27 | 2013 | R | 33 | 0 | 0 | 6.35 | .317 | .410 | 1.82 | 8.2 | 8.2 | 12.3 | 11 | 10 | 2 | 10 | 15 | 0 | 0 | 0 | 31 | 0 | C |
| RP | Beato, P.Beato, Pedro >> | 26 | 2013 | R | 29 | 1 | 1 | 3.60 | .259 | .350 | 1.40 | 10.8 | 1.8 | 4.5 | 10 | 12 | 1 | 2 | 5 | 0 | 0 | 0 | 23 | +0.02 | C |
| RP | Thornton, M.Thornton, Matt >> | 37 | 2013 | L | 31 | 0 | 4 | 3.74 | .308 | .360 | 1.44 | 9.8 | 3.1 | 6.3 | 43 | 47 | 4 | 15 | 30 | 0 | 0 | 2 | 23 | +0.42 | C |
| SP | Webster, A.Webster, Allen >> | 23 | 2013 | R | 6 | 1 | 2 | 8.60 | .355 | .410 | 1.83 | 11.1 | 5.4 | 6.9 | 30 | 37 | 7 | 18 | 23 | 0 | 0 | 1 | 68 | -1.06 | C |
| RP | Wright, S.Wright, Steven >> | 28 | 2013 | R | 32 | 2 | 0 | 5.40 | .300 | .380 | 1.62 | 8.3 | 6.2 | 6.9 | 13 | 12 | 0 | 9 | 10 | 0 | 0 | 2 | 59 | -0.09 | C |
| SP | Dempster, R.Dempster, Ryan >> | 36 | 2013 | R | 36 | 8 | 9 | 4.57 | .323 | .360 | 1.46 | 8.9 | 4.2 | 8.3 | 171 | 170 | 26 | 79 | 157 | 0 | 0 | 9 | 95 | 0 | C |
| SP | Aceves, A.Aceves, Alfredo >> | 31 | 2013 | R | 9 | 4 | 1 | 4.86 | .346 | .400 | 1.73 | 10.2 | 5.4 | 5.8 | 37 | 42 | 8 | 22 | 24 | 0 | 0 | 0 | 61 | +0.02 | C |
| RP | Mortensen, C.Mortensen, Clayton >> | 28 | 2013 | R | 24 | 1 | 2 | 5.34 | .324 | .380 | 1.60 | 9.6 | 4.8 | 6.3 | 30 | 32 | 3 | 16 | 21 | 0 | 0 | 1 | 25 | -0.31 | C |
| RP | Morales, F.Morales, Franklin >> | 27 | 2013 | L | 37 | 2 | 2 | 4.62 | .315 | .370 | 1.56 | 8.6 | 5.4 | 7.6 | 25 | 24 | 2 | 15 | 21 | 0 | 0 | 3 | 25 | -0.02 | C |
| RP | Hanrahan, J.Hanrahan, Joel >> | 32 | 2013 | R | 6 | 0 | 1 | 9.82 | .340 | .460 | 2.29 | 12.9 | 7.7 | 6.4 | 7 | 10 | 4 | 6 | 5 | 0 | 4 | 1 | 23 | -0.52 | C |
| RP | Wilson, A.Wilson, Alex >> | 26 | 2013 | R | 14 | 1 | 1 | 4.88 | .345 | .400 | 1.78 | 11.3 | 4.7 | 7.3 | 27 | 34 | 0 | 14 | 22 | 0 | 0 | 1 | 23 | -0.16 | C |
| RP | De La Rosa, R.De La Rosa, Rubby >> | 24 | 2013 | R | 16 | 0 | 2 | 5.56 | .283 | .370 | 1.55 | 12.3 | 1.6 | 4.9 | 11 | 15 | 2 | 2 | 6 | 0 | 0 | 1 | 23 | -0.1 | C |