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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lateef Ubaya | 1979-1982 | 30 | 13 | .698 | 3.54 | 80 | 71 | 7 | 3 | 0 | 419.2 | 407 | 165 | 24 | 149 | 175 |
| Bailey Udall | 1954-1958 | 17 | 9 | .654 | 4.87 | 104 | 0 | 0 | 0 | 21 | 183.0 | 180 | 99 | 15 | 120 | 139 |
| Ogai Uemura | 1989-1989 | 0 | 0 | .000 | 16.20 | 1 | 0 | 0 | 0 | 0 | 1.2 | 6 | 3 | 0 | 1 | 0 |
| Munemori Ueshima | 1986-1991 | 50 | 32 | .610 | 4.00 | 110 | 103 | 29 | 4 | 1 | 741.2 | 788 | 330 | 28 | 253 | 194 |
| Dwight Underwood | 1990-1990 | 0 | 0 | .000 | 10.80 | 1 | 0 | 0 | 0 | 0 | 3.1 | 5 | 4 | 0 | 5 | 1 |
| Willis Underwood | 1989-1989 | 1 | 0 | 1.000 | 6.75 | 2 | 0 | 0 | 0 | 0 | 4.0 | 5 | 3 | 0 | 5 | 3 |
| Baskin Upham | 1953-1953 | 8 | 11 | .421 | 4.85 | 23 | 23 | 5 | 1 | 0 | 165.0 | 172 | 89 | 8 | 107 | 61 |
| Jorge Urbina | 1988-1990 | 4 | 6 | .400 | 4.34 | 18 | 14 | 0 | 0 | 0 | 76.2 | 68 | 37 | 3 | 61 | 23 |
| José Uribe | 1987-1987 | 0 | 0 | .000 | 3.00 | 1 | 0 | 0 | 0 | 0 | 3.0 | 2 | 1 | 0 | 0 | 0 |
| Achim Utpadel | 1983-1989 | 24 | 21 | .533 | 5.67 | 228 | 1 | 0 | 0 | 34 | 371.2 | 407 | 234 | 37 | 250 | 238 |
| James Utting | 1958-1973 | 23 | 12 | .657 | 4.52 | 118 | 0 | 0 | 0 | 23 | 267.0 | 282 | 134 | 17 | 170 | 131 |
| Vanyusha Uvadiev | 1985-1987 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
