| 12/31/2014 | ||||||
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| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Charles O'Connor | 2012-2014 | 14 | 13 | .519 | 2.78 | 215 | 0 | 0 | 0 | 42 | 233.1 | 195 | 72 | 13 | 81 | 250 |
| Brian O'Keggan | 2012-2014 | 16 | 17 | .485 | 4.22 | 163 | 23 | 1 | 1 | 1 | 313.1 | 361 | 147 | 48 | 69 | 200 |
| Jeff O'Macken | 2012-2012 | 0 | 2 | .000 | 11.93 | 5 | 3 | 0 | 0 | 0 | 14.1 | 31 | 19 | 5 | 10 | 10 |
| Dave O'Rorke | 2012-2012 | 4 | 4 | .500 | 5.31 | 17 | 14 | 0 | 0 | 0 | 79.2 | 97 | 47 | 10 | 41 | 42 |
| Francisco Ochoa | 2014-2014 | 0 | 2 | .000 | 14.46 | 3 | 3 | 0 | 0 | 0 | 9.1 | 21 | 15 | 3 | 8 | 6 |
| Tsumemasa Okada | 2012-2014 | 12 | 4 | .750 | 4.73 | 142 | 1 | 0 | 0 | 4 | 173.0 | 184 | 91 | 15 | 77 | 121 |
| Wesley Oliver | 2012-2012 | 2 | 3 | .400 | 5.62 | 51 | 0 | 0 | 0 | 1 | 73.2 | 88 | 46 | 12 | 42 | 52 |
| Jeff Olsen | 2014-2014 | 9 | 7 | .563 | 4.87 | 20 | 20 | 2 | 0 | 0 | 114.2 | 102 | 62 | 9 | 42 | 53 |
| Marshall Olsen | 2012-2014 | 9 | 12 | .429 | 4.42 | 159 | 1 | 0 | 0 | 24 | 181.1 | 171 | 89 | 20 | 77 | 209 |
| Ramiro Ortega | 2012-2014 | 4 | 4 | .500 | 5.90 | 122 | 4 | 0 | 0 | 4 | 151.0 | 189 | 99 | 17 | 85 | 132 |
| Ryan Owens | 2012-2013 | 8 | 9 | .471 | 6.07 | 35 | 16 | 0 | 0 | 1 | 121.2 | 153 | 82 | 17 | 69 | 85 |
| Tom Owens | 2012-2014 | 21 | 27 | .438 | 3.73 | 127 | 64 | 0 | 0 | 7 | 453.1 | 446 | 188 | 21 | 185 | 335 |
| Tom Owens | 2013-2014 | 15 | 17 | .469 | 4.24 | 42 | 42 | 2 | 0 | 0 | 250.1 | 268 | 118 | 24 | 112 | 139 |
