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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 |
|---|---|---|---|---|---|---|---|---|---|
| Lateef Ubaya | 1979-1982 | .000 | 0 | 0 | 30 | 13 | 0 | 3.54 | 175 |
| Aarnoud Ubbens | 1953-1953 | .251 | 4 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Horiuchi Uchiyama | 1974-1985 | .295 | 30 | 260 | 0 | 0 | 0 | 0.00 | 0 |
| Bailey Udall | 1954-1958 | .000 | 0 | 0 | 17 | 9 | 21 | 4.87 | 139 |
| Ogai Uemura | 1989-1989 | .000 | 0 | 0 | 0 | 0 | 0 | 16.20 | 0 |
| Munemori Ueshima | 1986-1991 | .000 | 0 | 0 | 50 | 32 | 1 | 4.00 | 194 |
| José Ulerio | 1925-1930 | .271 | 7 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Khaled Umar | 1983-1983 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Dwight Underwood | 1990-1990 | .000 | 0 | 0 | 0 | 0 | 0 | 10.80 | 1 |
| Michael Underwood | 1933-1933 | .276 | 1 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Willis Underwood | 1989-1989 | .000 | 0 | 0 | 1 | 0 | 0 | 6.75 | 3 |
| Baskin Upham | 1953-1953 | .000 | 0 | 0 | 8 | 11 | 0 | 4.85 | 61 |
| Jorge Urbina | 1988-1990 | .000 | 0 | 0 | 4 | 6 | 0 | 4.34 | 23 |
| Francisco Uribe | 1924-1927 | .317 | 3 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| José Uribe | 1987-1987 | .000 | 0 | 0 | 0 | 0 | 0 | 3.00 | 0 |
| Juan Uribe | 1975-1975 | .291 | 10 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Urmston | 1939-1939 | .162 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Armandek Uryniuk | 1975-1976 | .313 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Maziba Usaama | 1977-1979 | .237 | 7 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Achim Utpadel | 1983-1989 | .000 | 0 | 0 | 24 | 21 | 34 | 5.67 | 238 |
| James Utting | 1958-1973 | .000 | 0 | 0 | 23 | 12 | 23 | 4.52 | 131 |
| Matt Utting | 1925-1925 | .354 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Vanyusha Uvadiev | 1985-1987 | .378 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
