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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Charles O'Brian | 2011-2012 | 10 | 9 | .526 | 4.70 | 32 | 32 | 0 | 0 | 0 | 157.0 | 150 | 82 | 23 | 75 | 141 |
| Alexis O'Day | 2010-2010 | 12 | 5 | .706 | 3.02 | 26 | 26 | 0 | 0 | 0 | 158.0 | 125 | 53 | 15 | 65 | 166 |
| Walton O'Rorke | 2013-2013 | 2 | 11 | .154 | 5.36 | 14 | 14 | 2 | 0 | 0 | 82.1 | 90 | 49 | 8 | 42 | 61 |
| Tomás Ochoa | 2013-2013 | 0 | 0 | .000 | 5.06 | 9 | 0 | 0 | 0 | 0 | 16.0 | 16 | 9 | 3 | 6 | 10 |
| Ernesto Oliveira | 2012-2013 | 14 | 8 | .636 | 2.67 | 90 | 4 | 0 | 0 | 19 | 131.2 | 101 | 39 | 12 | 60 | 122 |
| Kyle Olson | 2012-2013 | 33 | 3 | .917 | 2.89 | 42 | 42 | 9 | 3 | 0 | 308.0 | 233 | 99 | 30 | 101 | 250 |
| Mason Olson | 2011-2013 | 17 | 15 | .531 | 3.10 | 59 | 57 | 1 | 0 | 0 | 287.2 | 239 | 99 | 20 | 86 | 286 |
| Ángel Orosco | 2011-2013 | 10 | 15 | .400 | 3.50 | 99 | 16 | 0 | 0 | 24 | 185.0 | 186 | 72 | 17 | 59 | 202 |
| Jimmy Osborne | 2010-2011 | 14 | 13 | .519 | 5.21 | 52 | 43 | 0 | 0 | 0 | 214.1 | 242 | 124 | 36 | 77 | 174 |
