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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yushiro Uchida | 1987-1987 | 4 | 6 | .400 | 2.63 | 41 | 0 | 0 | 0 | 27 | 41.0 | 27 | 12 | 4 | 15 | 54 |
| Kanko Ueno | 1983-1983 | 2 | 3 | .400 | 1.23 | 27 | 0 | 0 | 0 | 18 | 29.1 | 23 | 4 | 0 | 5 | 20 |
| Andre Ulleri | 2045-2059 | 3 | 7 | .300 | 4.70 | 18 | 10 | 0 | 0 | 2 | 69.0 | 64 | 36 | 8 | 37 | 76 |
| James Ulusu | 2037-2049 | 11 | 13 | .458 | 3.30 | 57 | 42 | 0 | 0 | 0 | 259.0 | 255 | 95 | 18 | 80 | 166 |
| Zackary Umemoto | 2056-2060 | 23 | 16 | .590 | 3.33 | 57 | 57 | 0 | 0 | 0 | 321.1 | 268 | 119 | 39 | 96 | 448 |
| Robby Umlauf | 2027-2039 | 10 | 7 | .588 | 3.66 | 61 | 26 | 0 | 0 | 1 | 191.2 | 190 | 78 | 9 | 93 | 152 |
| Jack Underdown | 1980-1986 | 9 | 7 | .562 | 3.77 | 27 | 24 | 0 | 0 | 1 | 150.1 | 138 | 63 | 8 | 57 | 96 |
| Armando Ureste | 1991-2014 | 13 | 8 | .619 | 3.46 | 129 | 0 | 0 | 0 | 39 | 158.2 | 171 | 61 | 7 | 63 | 138 |
| Edwin Uribe | 2004-2004 | 10 | 5 | .667 | 3.09 | 18 | 18 | 0 | 0 | 0 | 119.1 | 109 | 41 | 8 | 39 | 95 |
| Monte Uro | 1983-1983 | 6 | 0 | 1.000 | 2.18 | 27 | 0 | 0 | 0 | 16 | 33.0 | 19 | 8 | 1 | 17 | 46 |
| Juan Urrego | 1983-1983 | 11 | 7 | .611 | 2.50 | 26 | 26 | 4 | 3 | 0 | 187.0 | 170 | 52 | 5 | 52 | 99 |
