Between the 2006 and 2009 seasons, Scott Olsen had the worst ERA for the Florida Marlins when pitching at least 200 innings, with an ERA of 4.65.
| NAME | ERA | IP | G | W | L | W% | GS | SO | CG | SHO | SV | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | K/9 | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | ERA- | FIP | FIP- | H/9 | PRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | S. Olsen | 4.65 | 559.0 | 97 | 30 | 36 | .455 | 97 | 412 | 0 | 0 | 0 | 581 | 289 | 334 | 82 | 229 | 11 | 0 | 18 | 2,442 | 21 | 6.63 | 3.69 | 1.80 | 1.32 | 16.9 | 9.4 | 1.45 | .292 | 5.38 | 107 | 4.88 | 112 | 9.35 | -32 |
| 2 | | D. Willis | 4.49 | 428.2 | 69 | 22 | 27 | .449 | 69 | 306 | 4 | 1 | 0 | 475 | 214 | 237 | 50 | 170 | 33 | 0 | 10 | 1,917 | 15 | 6.42 | 3.57 | 1.80 | 1.05 | 16.0 | 8.9 | 1.50 | .313 | 4.98 | 102 | 4.69 | 106 | 9.97 | -12.4 |
| 3 | | R. Nolasco | 4.43 | 558.2 | 105 | 40 | 30 | .571 | 89 | 491 | 3 | 1 | 0 | 563 | 275 | 301 | 74 | 136 | 19 | 0 | 20 | 2,365 | 11 | 7.91 | 2.19 | 3.61 | 1.19 | 20.8 | 5.8 | 1.25 | .297 | 4.85 | 103 | 3.92 | 91 | 9.07 | 22.3 |
| 4 | | C. Volstad | 4.40 | 243.1 | 44 | 15 | 17 | .469 | 43 | 159 | 1 | 1 | 0 | 245 | 119 | 130 | 32 | 95 | 8 | 0 | 7 | 1,047 | 8 | 5.88 | 3.51 | 1.67 | 1.18 | 15.2 | 9.1 | 1.40 | .283 | 4.81 | 103 | 4.77 | 114 | 9.06 | -16.3 |
| 5 | | A. Sanchez | 3.86 | 282.0 | 50 | 18 | 17 | .514 | 49 | 207 | 2 | 1 | 0 | 271 | 121 | 130 | 29 | 138 | 13 | 0 | 9 | 1,244 | 8 | 6.61 | 4.40 | 1.50 | 0.93 | 16.6 | 11.1 | 1.45 | .282 | 4.15 | 89 | 4.61 | 107 | 8.65 | -9.4 |
| 6 | | R. Pinto | 3.70 | 214.1 | 224 | 8 | 10 | .444 | 0 | 206 | 0 | 0 | 2 | 170 | 88 | 95 | 23 | 143 | 10 | 33 | 6 | 936 | 18 | 8.65 | 6.00 | 1.44 | 0.97 | 22.0 | 15.3 | 1.46 | .265 | 3.99 | 85 | 4.76 | 111 | 7.14 | -11.1 |
| 7 | | J. Johnson | 3.40 | 469.0 | 82 | 34 | 16 | .680 | 75 | 415 | 3 | 0 | 0 | 437 | 177 | 193 | 36 | 165 | 11 | 1 | 16 | 1,961 | 18 | 7.96 | 3.17 | 2.52 | 0.69 | 21.2 | 8.4 | 1.28 | .301 | 3.70 | 79 | 3.47 | 81 | 8.39 | 42.3 |
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