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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 |
|---|---|---|---|---|---|---|---|---|---|
| Andry Ubiera | 2013-2014 | .000 | 0 | 0 | 0 | 4 | 0 | 8.87 | 18 |
| Adonis Uceta | 2017-2017 | .000 | 0 | 0 | 4 | 0 | 11 | 1.26 | 47 |
| Koji Uehara | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 9.00 | 1 |
| Dan Uggla | 2015-2015 | .167 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Colt Uhlir | 2028-2029 | .211 | 5 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Ullmann | 2014-2015 | .000 | 0 | 0 | 5 | 3 | 4 | 5.00 | 55 |
| Danny Ulloa | 2028-2031 | .300 | 19 | 127 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ulrich | 2025-2026 | .000 | 0 | 0 | 5 | 3 | 2 | 3.53 | 68 |
| Dustin Umberger | 2012-2012 | .000 | 0 | 0 | 1 | 2 | 4 | 4.39 | 35 |
| Mike Umhoefer | 2025-2026 | .000 | 0 | 0 | 3 | 3 | 0 | 4.09 | 113 |
| Luis Unda | 2011-2011 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Marc Underwood | 2025-2025 | .000 | 0 | 0 | 3 | 1 | 0 | 1.80 | 38 |
| Steven Upchurch | 2011-2012 | .000 | 0 | 0 | 7 | 10 | 5 | 4.33 | 86 |
| Casey Upperman | 2013-2013 | .000 | 0 | 0 | 0 | 4 | 0 | 8.86 | 26 |
| Armond Upshaw | 2018-2021 | .232 | 4 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Uptegrove | 2033-2033 | .000 | 0 | 0 | 4 | 13 | 0 | 4.02 | 118 |
| Terukatsu Urata | 2034-2036 | .201 | 17 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Austin Urban | 2014-2014 | .000 | 0 | 0 | 3 | 4 | 5 | 4.01 | 38 |
| Luis Urbano | 2024-2024 | .000 | 0 | 0 | 0 | 2 | 16 | 1.90 | 46 |
| Ivan Urbina | 2031-2032 | .105 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Pat Urckfitz | 2009-2009 | .000 | 0 | 0 | 4 | 1 | 13 | 2.57 | 42 |
| Gregorio Urena | 2033-2033 | .000 | 0 | 0 | 11 | 2 | 8 | 0.44 | 45 |
| Jose Urena | 2012-2012 | .000 | 0 | 0 | 9 | 6 | 2 | 3.38 | 101 |
| Luis Urena | 2013-2013 | .194 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Urena | 2020-2020 | .235 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Elias Urenda | 2028-2029 | .000 | 0 | 0 | 5 | 7 | 1 | 4.77 | 83 |
| David Ureste | 2034-2034 | .262 | 18 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Ureta | 2036-2036 | .250 | 8 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Uriarte | 2019-2019 | .200 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Isaias Uribe | 2024-2024 | .000 | 0 | 0 | 1 | 4 | 7 | 3.97 | 39 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Sandy Uribe | 2029-2029 | .233 | 7 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Urie | 2035-2035 | .000 | 0 | 0 | 6 | 8 | 2 | 4.20 | 71 |
| Ivan Urrutia | 2033-2034 | .253 | 3 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Angelo Uvalle | 2029-2029 | .305 | 1 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Cole Uvila | 2019-2020 | .000 | 0 | 0 | 6 | 3 | 1 | 2.73 | 89 |
| Brad Uzelac | 2035-2036 | .252 | 3 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Manny Uzueta | 2025-2025 | .266 | 16 | 49 | 0 | 0 | 0 | 0.00 | 0 |
