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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 |
|---|---|---|---|---|---|---|---|---|---|
| Yaichiro Ueda | 2026-2028 | .328 | 35 | 209 | 0 | 0 | 0 | 0.00 | 0 |
| Cody Ulrich | 2032-2033 | .227 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Shawn Ungar | 2014-2026 | .148 | 0 | 0 | 28 | 24 | 11 | 5.25 | 191 |
| Jim Unknown | 2031-2031 | .143 | 0 | 1 | 2 | 4 | 1 | 5.37 | 33 |
| Jim Unknown | 2033-2033 | .286 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Lorenzo Urbina | 2029-2033 | .070 | 0 | 3 | 11 | 16 | 0 | 4.60 | 154 |
| Juan Uribe | 2001-2007 | .252 | 29 | 178 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Uribe | 2030-2033 | .271 | 43 | 286 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Urrutia | 2010-2027 | .299 | 213 | 1046 | 0 | 0 | 0 | 0.00 | 0 |
| Chase Utley | 2003-2018 | .262 | 423 | 1356 | 0 | 0 | 0 | 0.00 | 0 |
