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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Donkal Ubriani | 2019-2019 | .000 | 0 | 0 | 3 | 9 | 0 | 5.73 | 73 |
| Marcos Uceda | 2057-2057 | .000 | 0 | 0 | 0 | 0 | 0 | 6.00 | 3 |
| Katsumi Uchida | 2017-2026 | .247 | 2 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Kawanari Uchida | 2026-2031 | .000 | 0 | 0 | 6 | 16 | 55 | 4.24 | 181 |
| Koryusai Uchida | 2023-2024 | .000 | 0 | 0 | 15 | 15 | 0 | 4.88 | 256 |
| Mushanokoji Uchida | 2013-2013 | .000 | 0 | 0 | 11 | 9 | 0 | 2.72 | 148 |
| Naizen Uchiyama | 2025-2028 | .000 | 0 | 0 | 22 | 16 | 2 | 3.62 | 319 |
| Yasujiro Uchiyama | 2017-2018 | .310 | 10 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Takafumi Ueno | 2026-2029 | .275 | 3 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshiaga Ueno | 2016-2016 | .000 | 0 | 0 | 4 | 12 | 0 | 3.97 | 94 |
| Eddie Ugalde | 2043-2044 | .000 | 0 | 0 | 11 | 13 | 0 | 4.33 | 205 |
| Juan Ugarte | 2049-2049 | .000 | 0 | 0 | 2 | 1 | 22 | 2.16 | 40 |
| Nate Ulan | 2049-2050 | .302 | 34 | 176 | 0 | 0 | 0 | 0.00 | 0 |
| Omar Ulloa | 2053-2053 | .000 | 0 | 0 | 2 | 1 | 0 | 2.49 | 25 |
| Jeremy Ulrich | 2042-2043 | .000 | 0 | 0 | 12 | 8 | 24 | 3.87 | 164 |
| Mitsuhide Umaba | 2017-2027 | .221 | 14 | 96 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Umbro | 2057-2057 | .224 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Umlah | 2054-2054 | .000 | 0 | 0 | 0 | 0 | 3 | 0.00 | 2 |
| Roger Underhill | 2056-2057 | .000 | 0 | 0 | 1 | 2 | 0 | 4.87 | 24 |
| Phil Uppole | 2056-2057 | .185 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Urban | 2034-2035 | .279 | 14 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Aidan Uren | 2021-2030 | .000 | 0 | 0 | 6 | 4 | 2 | 3.55 | 73 |
| Jesus Urenda | 2053-2057 | .000 | 0 | 0 | 30 | 16 | 5 | 3.73 | 504 |
| Luis Uresti | 2046-2046 | .000 | 0 | 0 | 5 | 2 | 0 | 3.77 | 57 |
| Domingo Uribe | 2048-2050 | .277 | 7 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Julio Uribe | 2034-2036 | .000 | 0 | 0 | 9 | 12 | 2 | 5.47 | 130 |
| Manuel Uribe | 2056-2057 | .242 | 25 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Uribe | 2035-2035 | .194 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Antonio Urra | 2049-2049 | .000 | 0 | 0 | 5 | 9 | 12 | 4.28 | 121 |
| Dale Urry | 2048-2049 | .000 | 0 | 0 | 3 | 2 | 10 | 3.72 | 65 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Hiyutaro Ushijima | 2029-2039 | .244 | 20 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Frankie Utility | 2040-2040 | .224 | 14 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Utley | 2055-2055 | .000 | 0 | 0 | 3 | 4 | 0 | 3.86 | 63 |
| Divyaprabhava Utpat | 2044-2045 | .000 | 0 | 0 | 20 | 7 | 0 | 3.68 | 243 |
| Brian Utt | 2055-2055 | .000 | 0 | 0 | 0 | 0 | 0 | 11.57 | 8 |
| Justin Utting | 2038-2038 | .000 | 0 | 0 | 0 | 1 | 0 | 4.91 | 11 |
