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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bruce Ubillus | 2061-2062 | 4 | 1 | .800 | 3.35 | 73 | 2 | 0 | 0 | 3 | 126.1 | 110 | 47 | 10 | 78 | 102 |
| Hiroshige Uchida | 2002-2018 | 75 | 98 | .434 | 4.52 | 329 | 215 | 12 | 3 | 5 | 1462.1 | 1664 | 734 | 186 | 351 | 793 |
| Kojuro Ueda | 2045-2049 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 |
| Ryuza Ueda | 2056-2060 | 0 | 0 | .000 | 18.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 3 | 2 | 1 | 0 | 0 |
| Rikyu Uemura | 2019-2026 | 17 | 21 | .447 | 4.14 | 411 | 1 | 0 | 0 | 20 | 460.1 | 396 | 212 | 7 | 358 | 326 |
| Mushanokoji Uenohara | 2023-2030 | 17 | 17 | .500 | 3.88 | 354 | 0 | 0 | 0 | 10 | 368.2 | 360 | 159 | 34 | 190 | 355 |
| Jason Uhlman | 2070-2070 | 0 | 1 | .000 | 13.11 | 8 | 0 | 0 | 0 | 0 | 11.2 | 15 | 17 | 3 | 14 | 4 |
| Yobal Ulacia | 2067-2079 | 112 | 123 | .477 | 4.13 | 385 | 304 | 16 | 7 | 7 | 1961.1 | 1686 | 899 | 158 | 796 | 2100 |
| Yasushi Umaba | 2040-2041 | 1 | 2 | .333 | 4.10 | 58 | 0 | 0 | 0 | 0 | 98.2 | 104 | 45 | 17 | 26 | 67 |
| Evan Umagas | 2073-2079 | 38 | 37 | .507 | 4.26 | 245 | 78 | 1 | 1 | 4 | 628.0 | 592 | 297 | 66 | 283 | 644 |
| Danny Umana | 2068-2078 | 52 | 33 | .612 | 3.79 | 561 | 18 | 0 | 0 | 28 | 830.1 | 713 | 350 | 100 | 388 | 917 |
| Jeff Umlah | 2069-2081 | 132 | 117 | .530 | 4.02 | 384 | 322 | 6 | 1 | 4 | 2086.2 | 1914 | 932 | 184 | 1016 | 2066 |
| Jonathan Umlah | 2016-2026 | 45 | 46 | .495 | 4.18 | 699 | 0 | 0 | 0 | 101 | 673.1 | 605 | 313 | 69 | 372 | 769 |
| Bull Underhay | 2052-2062 | 111 | 106 | .512 | 4.14 | 313 | 313 | 6 | 3 | 0 | 1884.0 | 2000 | 866 | 236 | 513 | 1357 |
| Jean Unho | 2005-2010 | 9 | 17 | .346 | 4.85 | 134 | 19 | 0 | 0 | 2 | 248.2 | 250 | 134 | 23 | 145 | 222 |
| Masaru Uno | 2072-2081 | 94 | 58 | .618 | 3.68 | 225 | 213 | 6 | 4 | 0 | 1309.2 | 1253 | 536 | 107 | 325 | 1096 |
| Andy Urbano | 2059-2070 | 40 | 53 | .430 | 3.66 | 601 | 32 | 0 | 0 | 99 | 857.1 | 799 | 349 | 69 | 380 | 753 |
| David Urbina | 2062-2062 | 1 | 2 | .333 | 6.49 | 14 | 5 | 0 | 0 | 1 | 34.2 | 47 | 25 | 10 | 18 | 21 |
| Jose Uresti | 2066-2081 | 175 | 150 | .538 | 3.42 | 461 | 459 | 18 | 7 | 1 | 2936.1 | 2786 | 1116 | 255 | 436 | 2552 |
| Jonathan Urgunenu | 2058-2064 | 25 | 18 | .581 | 5.50 | 258 | 0 | 0 | 0 | 5 | 310.2 | 368 | 190 | 34 | 143 | 189 |
| Dave Uribe | 2068-2068 | 0 | 0 | .000 | 6.00 | 8 | 0 | 0 | 0 | 0 | 9.0 | 10 | 6 | 0 | 5 | 7 |
| Uno Urquidez | 2077-2081 | 30 | 43 | .411 | 5.00 | 202 | 95 | 0 | 0 | 2 | 636.0 | 684 | 353 | 79 | 257 | 635 |
| Pedro Urquiola | 2073-2080 | 11 | 22 | .333 | 4.44 | 110 | 54 | 0 | 0 | 2 | 318.0 | 311 | 157 | 32 | 131 | 265 |
| Alexei Urrutia | 2068-2080 | 57 | 77 | .425 | 3.88 | 464 | 158 | 1 | 0 | 58 | 1158.2 | 1134 | 500 | 95 | 404 | 1052 |
| Mike Ushman | 2058-2066 | 20 | 20 | .500 | 3.19 | 91 | 76 | 0 | 0 | 0 | 366.1 | 317 | 130 | 25 | 155 | 335 |
| Yuuya Usui | 2072-2081 | 89 | 69 | .563 | 3.70 | 400 | 190 | 1 | 1 | 19 | 1375.0 | 1293 | 566 | 165 | 452 | 1364 |
| Yasutoki Utagawa | 2037-2048 | 33 | 58 | .363 | 4.84 | 553 | 16 | 0 | 0 | 109 | 635.2 | 639 | 342 | 100 | 411 | 725 |
