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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Donkal Ubriani | 2022-2033 | 5 | 4 | .556 | 3.24 | 17 | 17 | 0 | 0 | 0 | 91.2 | 74 | 33 | 7 | 25 | 100 |
| Kawanari Uchida | 2027-2036 | 13 | 20 | .394 | 5.01 | 182 | 0 | 0 | 0 | 36 | 172.1 | 184 | 96 | 27 | 87 | 184 |
| Koryusai Uchida | 2025-2032 | 9 | 9 | .500 | 5.23 | 36 | 36 | 0 | 0 | 0 | 186.0 | 204 | 108 | 27 | 82 | 194 |
| Mushanokoji Uchida | 2016-2030 | 40 | 25 | .615 | 5.34 | 150 | 78 | 0 | 0 | 3 | 512.2 | 650 | 304 | 58 | 150 | 339 |
| Naizen Uchiyama | 2029-2043 | 29 | 39 | .426 | 5.41 | 303 | 28 | 0 | 0 | 32 | 495.1 | 607 | 298 | 62 | 209 | 396 |
| Yoshiaga Ueno | 2016-2019 | 13 | 19 | .406 | 6.38 | 109 | 27 | 0 | 0 | 4 | 223.0 | 286 | 158 | 13 | 97 | 166 |
| Eddie Ugalde | 2046-2051 | 9 | 16 | .360 | 5.44 | 41 | 40 | 0 | 0 | 0 | 236.2 | 291 | 143 | 30 | 69 | 161 |
| Omar Ulloa | 2054-2054 | 3 | 1 | .750 | 5.26 | 6 | 6 | 0 | 0 | 0 | 39.1 | 46 | 23 | 7 | 15 | 33 |
| Jeremy Ulrich | 2045-2051 | 10 | 7 | .588 | 4.06 | 98 | 12 | 1 | 0 | 6 | 270.1 | 245 | 122 | 33 | 85 | 220 |
| Joe Umlah | 2054-2056 | 7 | 2 | .778 | 2.93 | 38 | 0 | 0 | 0 | 25 | 46.0 | 29 | 15 | 7 | 14 | 47 |
| Jake Umstead | 2054-2057 | 12 | 11 | .522 | 5.13 | 69 | 25 | 5 | 0 | 1 | 296.1 | 319 | 169 | 47 | 143 | 229 |
| Jeff Urban | 2037-2046 | 0 | 1 | .000 | 17.18 | 3 | 0 | 0 | 0 | 0 | 3.2 | 4 | 7 | 0 | 7 | 1 |
| Aidan Uren | 2022-2029 | 21 | 20 | .512 | 5.32 | 279 | 9 | 0 | 0 | 29 | 451.2 | 493 | 267 | 63 | 212 | 373 |
| Luis Uresti | 2047-2048 | 7 | 13 | .350 | 5.42 | 28 | 28 | 0 | 0 | 0 | 166.0 | 175 | 100 | 18 | 89 | 128 |
| Julio Uribe | 2037-2045 | 25 | 22 | .532 | 4.26 | 283 | 0 | 0 | 0 | 32 | 357.0 | 376 | 169 | 23 | 179 | 305 |
| Monte Uribe | 2049-2055 | 12 | 2 | .857 | 1.98 | 72 | 0 | 0 | 0 | 32 | 86.1 | 50 | 19 | 3 | 43 | 85 |
| Alfredo Urquiza | 2053-2057 | 33 | 38 | .465 | 4.98 | 119 | 80 | 1 | 0 | 1 | 552.2 | 616 | 306 | 68 | 273 | 374 |
| Antonio Urra | 2048-2057 | 15 | 7 | .682 | 3.22 | 98 | 0 | 0 | 0 | 22 | 173.1 | 155 | 62 | 20 | 63 | 161 |
| Dale Urry | 2051-2057 | 16 | 18 | .471 | 5.11 | 109 | 13 | 0 | 0 | 26 | 220.0 | 232 | 125 | 24 | 100 | 230 |
| Tom Utley | 2056-2056 | 0 | 0 | .000 | 4.91 | 1 | 0 | 0 | 0 | 0 | 3.2 | 4 | 2 | 1 | 0 | 5 |
| Divyaprabhava Utpat | 2047-2053 | 21 | 10 | .677 | 5.54 | 94 | 19 | 0 | 0 | 2 | 213.0 | 242 | 131 | 32 | 132 | 171 |
| Justin Utting | 2038-2043 | 20 | 28 | .417 | 5.20 | 80 | 80 | 0 | 0 | 0 | 426.0 | 486 | 246 | 35 | 244 | 295 |
