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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 |
|---|---|---|---|---|---|---|---|---|---|
| Esteban Ucelay | 2028-2028 | .313 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Ryutaro Uchiyama | 2029-2035 | .133 | 0 | 1 | 23 | 36 | 86 | 4.24 | 335 |
| Kiyomitsu Ueda | 2049-2049 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Vincenzio Ugolino | 2046-2060 | .273 | 244 | 1081 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ugueto | 2002-2014 | .288 | 17 | 262 | 0 | 0 | 0 | 0.00 | 0 |
| John Ukon | 2021-2036 | .148 | 0 | 1 | 47 | 37 | 87 | 4.81 | 741 |
| Lanny Ulrich | 2026-2028 | .200 | 0 | 1 | 3 | 2 | 0 | 3.61 | 40 |
| Valentín Umanzo | 2031-2034 | .267 | 8 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Underwood | 2033-2033 | .111 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Bruce Ung | 2022-2032 | .059 | 0 | 0 | 15 | 33 | 0 | 6.03 | 233 |
| Ralph Upson | 2022-2025 | .188 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| B.J. Upton | 2005-2020 | .290 | 220 | 1023 | 0 | 0 | 0 | 0.00 | 0 |
| Emílio Urbina | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Urbina | 2042-2055 | .034 | 0 | 3 | 20 | 27 | 2 | 5.63 | 364 |
| Ugueth Urbina | 2001-2013 | .125 | 0 | 0 | 65 | 73 | 281 | 3.86 | 1161 |
| Lino Urdaneta | 2005-2019 | .036 | 0 | 1 | 92 | 62 | 130 | 3.86 | 954 |
| Juan Uribe | 2001-2016 | .270 | 100 | 655 | 0 | 0 | 0 | 0.00 | 0 |
| Ramiro Uribe | 2053-2055 | .000 | 0 | 0 | 0 | 0 | 0 | 2.70 | 0 |
| Benji Urrutia | 2017-2029 | .000 | 0 | 1 | 19 | 17 | 4 | 5.51 | 145 |
| Edwin Urrutia | 2013-2024 | .286 | 190 | 796 | 0 | 0 | 0 | 0.00 | 0 |
| Roman Urrutia | 2021-2022 | .250 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| William Utecht | 2014-2022 | .238 | 9 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Chase Utley | 2003-2016 | .259 | 179 | 778 | 0 | 0 | 0 | 0.00 | 0 |
