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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 | 2020-2021 | 28 | 15 | .651 | 3.64 | 65 | 65 | 0 | 0 | 0 | 375.2 | 351 | 152 | 38 | 159 | 330 |
| Kawanari Uchida | 2028-2032 | 12 | 4 | .750 | 3.82 | 130 | 0 | 0 | 0 | 30 | 122.2 | 113 | 52 | 12 | 61 | 127 |
| Koryusai Uchida | 2024-2025 | 12 | 9 | .571 | 3.81 | 33 | 33 | 0 | 0 | 0 | 186.2 | 158 | 79 | 17 | 109 | 186 |
| Mushanokoji Uchida | 2014-2015 | 18 | 18 | .500 | 4.81 | 49 | 49 | 0 | 0 | 0 | 275.1 | 290 | 147 | 29 | 114 | 199 |
| Naizen Uchiyama | 2029-2042 | 28 | 21 | .571 | 4.19 | 206 | 18 | 0 | 0 | 11 | 367.1 | 364 | 171 | 30 | 141 | 320 |
| Yoshiaga Ueno | 2016-2017 | 5 | 6 | .455 | 4.49 | 26 | 26 | 0 | 0 | 0 | 124.1 | 125 | 62 | 13 | 47 | 91 |
| Eddie Ugalde | 2045-2045 | 12 | 9 | .571 | 5.17 | 30 | 30 | 0 | 0 | 0 | 167.0 | 181 | 96 | 21 | 54 | 120 |
| Juan Ugarte | 2050-2050 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 0 | 0 | 0 | 0 | 0 |
| Omar Ulloa | 2053-2054 | 5 | 3 | .625 | 3.47 | 44 | 1 | 0 | 0 | 14 | 57.0 | 50 | 22 | 1 | 20 | 67 |
| Jeremy Ulrich | 2043-2044 | 4 | 9 | .308 | 4.30 | 45 | 0 | 0 | 0 | 11 | 58.2 | 48 | 28 | 7 | 34 | 65 |
| Joe Umlah | 2054-2055 | 2 | 3 | .400 | 6.08 | 32 | 1 | 0 | 0 | 16 | 37.0 | 48 | 25 | 6 | 13 | 32 |
| Jake Umstead | 2051-2054 | 7 | 2 | .778 | 4.66 | 38 | 5 | 0 | 0 | 2 | 63.2 | 68 | 33 | 8 | 31 | 53 |
| Aidan Uren | 2021-2029 | 12 | 14 | .462 | 4.87 | 196 | 1 | 0 | 0 | 31 | 253.0 | 225 | 137 | 25 | 203 | 244 |
| Jesus Urenda | 2054-2056 | 4 | 8 | .333 | 5.35 | 28 | 12 | 1 | 1 | 0 | 77.1 | 64 | 46 | 9 | 39 | 87 |
| Luis Uresti | 2046-2047 | 7 | 4 | .636 | 4.77 | 24 | 24 | 0 | 0 | 0 | 122.2 | 121 | 65 | 8 | 83 | 97 |
| Julio Uribe | 2036-2036 | 1 | 2 | .333 | 2.29 | 18 | 0 | 0 | 0 | 1 | 19.2 | 15 | 5 | 0 | 15 | 16 |
| Alfredo Urquiza | 2052-2053 | 3 | 4 | .429 | 4.00 | 13 | 10 | 0 | 0 | 1 | 72.0 | 64 | 32 | 4 | 35 | 52 |
| Antonio Urra | 2048-2050 | 3 | 7 | .300 | 3.08 | 48 | 0 | 0 | 0 | 19 | 61.1 | 50 | 21 | 5 | 21 | 78 |
| Dale Urry | 2049-2050 | 9 | 11 | .450 | 4.90 | 66 | 15 | 0 | 0 | 14 | 148.2 | 152 | 81 | 10 | 71 | 139 |
| Tom Utley | 2056-2057 | 10 | 20 | .333 | 4.77 | 54 | 54 | 0 | 0 | 0 | 309.2 | 333 | 164 | 27 | 133 | 227 |
| Divyaprabhava Utpat | 2045-2046 | 14 | 4 | .778 | 3.01 | 29 | 15 | 0 | 0 | 1 | 143.1 | 111 | 48 | 15 | 51 | 181 |
| Brian Utt | 2055-2055 | 1 | 0 | 1.000 | 9.00 | 2 | 0 | 0 | 0 | 0 | 4.0 | 3 | 4 | 1 | 4 | 4 |
| Justin Utting | 2038-2044 | 1 | 0 | 1.000 | 3.23 | 14 | 2 | 0 | 0 | 1 | 30.2 | 34 | 11 | 3 | 20 | 31 |
