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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Calvin Underhay | 1-0 | 0 | 0 | .000 | 5.40 | 1 | 0 | 0 | 0 | 0 | 1.2 | 3 | 1 | 0 | 0 | 0 |
| Terry Underwood | 2-2013 | 35 | 32 | .522 | 5.05 | 112 | 98 | 2 | 1 | 0 | 552.0 | 583 | 310 | 77 | 308 | 441 |
| Alfredo Urbina | 4-1976 | 11 | 12 | .478 | 3.51 | 28 | 27 | 7 | 3 | 0 | 195.0 | 166 | 76 | 9 | 64 | 156 |
| Jorge Urbina | 0-2004 | 10 | 12 | .455 | 3.54 | 26 | 26 | 0 | 0 | 0 | 157.2 | 142 | 62 | 27 | 31 | 123 |
| Robinson Urbina | 3-2019 | 13 | 7 | .650 | 3.23 | 158 | 0 | 0 | 0 | 4 | 192.0 | 150 | 69 | 5 | 89 | 226 |
| Pedro Urdiano | 7-1991 | 38 | 37 | .507 | 4.71 | 93 | 93 | 21 | 0 | 0 | 638.2 | 736 | 334 | 46 | 188 | 356 |
