Sean O'Sullivan played 7 seasons for 5 teams, including the Phillies and Royals. He had 13 wins, 23 losses, an ERA of 6.01 and 158 strikeouts.
| NAME | SEASON | TM | G | W | L | W% | GS | ERA | SO | CG | SHO | SV | IP | 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. O'Sullivan | 2009 |  LAA | 12 | 4 | 2 | .667 | 10 | 5.92 | 29 | 0 | 0 | 0 | 51.2 | 60 | 34 | 34 | 12 | 16 | 1 | 1 | 1 | 227 | 1 | 5.05 | 2.79 | 1.81 | 2.09 | 12.8 | 7.0 | 1.47 | .284 | 5.92 | 134 | 5.97 | 137 | 10.45 | -9.3 |
| 2 | | S. O'Sullivan | 2010 | TOT | 19 | 4 | 6 | .400 | 14 | 5.49 | 43 | 0 | 0 | 0 | 83.2 | 90 | 51 | 53 | 15 | 31 | 1 | 3 | 2 | 368 | 4 | 4.63 | 3.33 | 1.39 | 1.61 | 11.7 | 8.4 | 1.45 | .270 | 5.70 | 132 | 5.52 | 134 | 9.68 | -13.2 |
| 3 | | S. O'Sullivan | 2011 |  KCR | 12 | 2 | 6 | .250 | 10 | 7.25 | 19 | 0 | 0 | 0 | 58.1 | 78 | 47 | 52 | 10 | 26 | 2 | 1 | 1 | 273 | 3 | 2.93 | 4.01 | 0.73 | 1.54 | 7.0 | 9.5 | 1.78 | .315 | 8.02 | 174 | 6.04 | 151 | 12.03 | -13.4 |
| 4 | | S. O'Sullivan | 2013 |  SDP | 7 | 0 | 2 | .000 | 3 | 3.96 | 12 | 0 | 0 | 0 | 25.0 | 31 | 11 | 12 | 0 | 14 | 1 | 2 | 1 | 118 | 0 | 4.32 | 5.04 | 0.86 | 0.00 | 10.2 | 11.9 | 1.80 | .341 | 4.32 | 112 | 3.88 | 105 | 11.16 | -0.6 |
| 5 | | S. O'Sullivan | 2014 |  PHI | 3 | 0 | 1 | .000 | 2 | 6.39 | 7 | 0 | 0 | 0 | 12.2 | 15 | 9 | 9 | 3 | 2 | 0 | 1 | 0 | 52 | 0 | 4.97 | 1.42 | 3.50 | 2.13 | 13.5 | 3.8 | 1.34 | .300 | 6.39 | 177 | 5.58 | 148 | 10.66 | -2.5 |
| 6 | | S. O'Sullivan | 2015 | PHI | 13 | 1 | 6 | .143 | 13 | 6.08 | 35 | 0 | 0 | 0 | 71.0 | 94 | 48 | 49 | 16 | 20 | 6 | 0 | 5 | 328 | 3 | 4.44 | 2.54 | 1.75 | 2.03 | 10.7 | 6.1 | 1.61 | .311 | 6.21 | 156 | 6.17 | 155 | 11.92 | -16.6 |
| 7 | | S. O'Sullivan | 2016 |  BOS | 5 | 2 | 0 | 1.000 | 4 | 6.75 | 13 | 0 | 0 | 0 | 21.1 | 30 | 16 | 17 | 3 | 6 | 2 | 1 | 0 | 98 | 2 | 5.48 | 2.53 | 2.17 | 1.27 | 13.3 | 6.1 | 1.69 | .365 | 7.17 | 153 | 4.87 | 116 | 12.66 | -1.6 |
| Total | 71 | 13 | 23 | .361 | 56 | 6.01 | 158 | 0 | 0 | 0 | 323.2 | 398 | 216 | 226 | 59 | 115 | 13 | 9 | 10 | 1,464 | 13 | 4.39 | 3.20 | 1.37 | 1.64 | 10.8 | 7.9 | 1.58 | .303 | 6.28 | 147 | 5.66 | 139 | 11.07 | -57.2 |
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HR
212
9th
R
778
8th
SO
1,471
3rd
ERA
3.79
8th
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