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| "U" Player Index | |
| Starts with "U" Career Batting Register
and Career Pitching Register Bold indicates a Hall of Famer. |
| Ubarri, Celestino | 2023-2023 |
| Ubarri, Eden | 2023-2028 |
| Ubarri, Hector | 2027-2036 |
| Ubeda, Ferdinand | 2033-2041 |
| Ugarte, Lino | 2039-2048 |
| Ummer, Howard | 2045-2045 |
| Underwood, Anthony | 2039-2044 |
| Updike, Robert | 2025-2037 |
| Upham, Vernon | 2027-2034 |
| Urias, Samuel | 2045-2048 |
| Urrutia, Hugo | 2023-2029 |
| Urrutia, Octavio | 2046-2048 |
| Usera, Tony | 2044-2046 |
| Utah, Johnny | 2036-2037 |
| Utsey, Devin | 2024-2024 |
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