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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 | 1989-2001 | 46 | 44 | .511 | 4.02 | 690 | 21 | 1 | 0 | 104 | 907.0 | 840 | 405 | 77 | 425 | 810 |
| Jiro Uchiyama | 2020-2026 | 0 | 1 | .000 | 36.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 2 | 4 | 1 | 2 | 0 |
| Kanko Ueno | 1984-1988 | 11 | 9 | .550 | 4.98 | 179 | 0 | 0 | 0 | 4 | 254.2 | 296 | 141 | 21 | 114 | 111 |
| Andre Ulleri | 2045-2057 | 92 | 80 | .535 | 3.79 | 487 | 172 | 7 | 3 | 29 | 1631.2 | 1717 | 687 | 173 | 427 | 1518 |
| James Ulusu | 2038-2047 | 44 | 48 | .478 | 3.96 | 271 | 101 | 6 | 0 | 8 | 969.0 | 977 | 426 | 106 | 283 | 622 |
| Robby Umlauf | 2030-2037 | 36 | 28 | .562 | 4.30 | 221 | 61 | 0 | 0 | 9 | 586.0 | 589 | 280 | 32 | 245 | 365 |
| Tommy Underberg | 2037-2040 | 0 | 0 | .000 | 9.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 2 | 1 | 0 | 3 | 0 |
| Jack Underdown | 1982-1984 | 14 | 13 | .519 | 5.61 | 59 | 38 | 0 | 0 | 1 | 237.1 | 216 | 148 | 18 | 181 | 146 |
| Armando Ureste | 1994-2012 | 126 | 120 | .512 | 3.26 | 1183 | 173 | 1 | 0 | 244 | 2078.2 | 1947 | 753 | 189 | 408 | 1870 |
| Edwin Uribe | 2006-2011 | 44 | 45 | .494 | 4.15 | 146 | 125 | 4 | 2 | 2 | 787.0 | 801 | 363 | 83 | 269 | 614 |
| Monte Uro | 1984-1988 | 5 | 9 | .357 | 6.09 | 152 | 0 | 0 | 0 | 1 | 208.1 | 214 | 141 | 47 | 112 | 244 |
| Juan Urrego | 1978-1982 | 57 | 54 | .514 | 4.77 | 148 | 148 | 18 | 3 | 0 | 877.0 | 927 | 465 | 82 | 330 | 595 |
