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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 |
|---|---|---|---|---|---|---|---|---|---|
| Stephon Ubanks | 2008-2017 | .000 | 0 | 0 | 2 | 4 | 0 | 5.47 | 74 |
| Willie Ubeda | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 6.00 | 11 |
| Yeremias Ubeda | 2044-2044 | .000 | 0 | 0 | 1 | 1 | 0 | 6.28 | 5 |
| Dave Uberti | 2027-2041 | .283 | 13 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| Lupe Ubinas | 2005-2008 | .000 | 0 | 0 | 10 | 6 | 1 | 6.11 | 101 |
| Johnny Uchida | 2036-2037 | .000 | 0 | 0 | 5 | 6 | 2 | 4.68 | 238 |
| Katsuo Ueda | 2037-2037 | .000 | 0 | 0 | 1 | 1 | 0 | 10.38 | 10 |
| Brandon Ueno | 2043-2043 | .225 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Jack Ugwu | 2035-2035 | .000 | 0 | 0 | 4 | 3 | 5 | 2.22 | 64 |
| Holden Uhl | 2025-2037 | .243 | 38 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Uhler | 2011-2011 | .000 | 0 | 0 | 0 | 1 | 0 | 8.53 | 7 |
| Marnix Uittenbogaard | 2026-2039 | .315 | 13 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Jacobo Ulibarri | 2041-2041 | .200 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Nanni Ulibarri | 2006-2017 | .247 | 49 | 162 | 0 | 0 | 0 | 0.00 | 0 |
| Germain Ulleri | 2030-2036 | .264 | 133 | 405 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ulloa | 2008-2009 | .400 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Ullrich | 2008-2012 | .000 | 0 | 0 | 8 | 6 | 5 | 4.29 | 141 |
| Jerel Ullrich | 2034-2042 | .000 | 0 | 0 | 26 | 12 | 2 | 3.44 | 275 |
| Kody Ulrich | 2012-2015 | .000 | 0 | 0 | 14 | 17 | 0 | 4.27 | 203 |
| Ron Ulrich | 2039-2045 | .000 | 0 | 0 | 7 | 12 | 4 | 4.42 | 183 |
| Vince Ulrich | 2015-2017 | .000 | 0 | 0 | 1 | 0 | 0 | 6.08 | 22 |
| Bear Umanzor | 2048-2050 | .278 | 36 | 160 | 0 | 0 | 0 | 0.00 | 0 |
| Roque Unas | 2019-2026 | .305 | 64 | 242 | 0 | 0 | 0 | 6.75 | 2 |
| Brad Underberg | 2010-2015 | .000 | 0 | 0 | 4 | 12 | 5 | 5.95 | 88 |
| Chase Underwood | 2013-2017 | .000 | 0 | 0 | 16 | 29 | 0 | 6.91 | 286 |
| Deron Underwood | 2045-2045 | .250 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jase Underwood | 2048-2048 | .000 | 0 | 0 | 1 | 2 | 0 | 12.27 | 2 |
| Jon Underwood | 2004-2008 | .215 | 9 | 42 | 2 | 3 | 0 | 5.09 | 28 |
| Jared Unfried | 2018-2022 | .264 | 33 | 109 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Unger | 2031-2032 | .219 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jason Unger | 2014-2014 | .000 | 0 | 0 | 0 | 2 | 0 | 12.71 | 4 |
| Joe Unger | 2004-2006 | .000 | 0 | 0 | 9 | 2 | 6 | 2.56 | 242 |
| Wally Unger | 2005-2007 | .000 | 0 | 0 | 4 | 9 | 1 | 3.61 | 110 |
| Skip Unruh | 2045-2045 | .000 | 0 | 0 | 3 | 3 | 20 | 1.67 | 50 |
| Marion Upson | 2045-2045 | .333 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Upton | 2019-2021 | .000 | 0 | 0 | 9 | 12 | 0 | 4.31 | 189 |
| Brendan Upton | 2024-2028 | .000 | 0 | 0 | 18 | 12 | 12 | 3.46 | 154 |
| Chase Urbach | 2050-2050 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ruben Urbina | 2017-2018 | .000 | 0 | 0 | 7 | 5 | 17 | 3.83 | 100 |
| Sergio Urbina | 2007-2011 | .280 | 103 | 283 | 0 | 0 | 0 | 0.00 | 0 |
| Tomas Urbina | 2034-2049 | .280 | 11 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Urcino | 2010-2024 | .275 | 9 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Leo Urdiales | 2014-2015 | .000 | 0 | 0 | 1 | 1 | 0 | 3.78 | 40 |
| Max Uren | 2049-2049 | .000 | 0 | 0 | 0 | 4 | 0 | 5.03 | 51 |
| Alex Urena | 2035-2035 | .000 | 0 | 0 | 1 | 3 | 0 | 5.33 | 70 |
| Alfredo Urena | 2004-2006 | .210 | 10 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Ismael Urena | 2008-2008 | .283 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Urena | 2011-2012 | .237 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Guillermo Ureña | 2039-2041 | .237 | 6 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Demetrio Urias | 2041-2042 | .253 | 5 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Hamilton Urias | 2035-2040 | .000 | 0 | 0 | 8 | 6 | 2 | 4.67 | 276 |
| Aarón Uribe | 2048-2050 | .000 | 0 | 0 | 6 | 10 | 14 | 3.98 | 88 |
| Dan Uribe | 2022-2028 | .000 | 0 | 0 | 13 | 12 | 28 | 2.74 | 169 |
| Esteban Uribe | 2007-2007 | .216 | 7 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Uribe | 2005-2010 | .233 | 26 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Uribe | 2032-2033 | .000 | 0 | 0 | 1 | 0 | 0 | 4.00 | 20 |
| Sergio Uribe | 2009-2011 | .280 | 35 | 98 | 0 | 0 | 0 | 0.00 | 0 |
| Tedd Uribe | 2049-2049 | .111 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Quintin Uridge | 2005-2005 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Juan Urieta | 2004-2006 | .284 | 16 | 115 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Alfredo Uriostegui | 2004-2012 | .263 | 75 | 311 | 0 | 0 | 0 | 11.70 | 8 |
| Mario Urista | 2020-2020 | .000 | 0 | 0 | 1 | 4 | 0 | 6.00 | 17 |
| Fernando Urroz | 2020-2024 | .229 | 30 | 120 | 0 | 0 | 0 | 0.00 | 0 |
| Kelly Ury | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pat Usher | 2017-2018 | .213 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Jadon Ushery | 2006-2007 | .194 | 15 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Raheem Ussin | 2007-2010 | .262 | 12 | 118 | 0 | 0 | 0 | 0.00 | 0 |
| Ludovico Usui | 2004-2014 | .246 | 137 | 417 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Utech | 2018-2022 | .258 | 0 | 65 | 0 | 0 | 0 | 0.00 | 0 |
