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| First Name | Last Name | Given Name | Birth Year | Birth Month | Birth Day | Birth City | Birth Country | Height | Weight | Age | Bats | Throws |
| Frank | Duffy | Frank Thomas | 1946 | 10 | 14 | Oakland | USA | 73 | 180 | -1947 | R | R |
| Year | Team | AB | HR | RBI | BA |
|---|---|---|---|---|---|
| 1970 | Cincinnati Reds | 11 | 0 | 0 | 0.1818 |
| 1971 | Cincinnati Reds | 16 | 0 | 1 | 0.1875 |
| 1971 | San Francisco Giants | 28 | 0 | 2 | 0.1786 |
| 1972 | Cleveland Indians | 385 | 3 | 27 | 0.2390 |
| 1973 | Cleveland Indians | 361 | 8 | 50 | 0.2632 |
| 1974 | Cleveland Indians | 549 | 8 | 48 | 0.2332 |
| 1975 | Cleveland Indians | 482 | 1 | 47 | 0.2427 |
| 1976 | Cleveland Indians | 392 | 2 | 30 | 0.2117 |
| 1977 | Cleveland Indians | 334 | 4 | 31 | 0.2006 |
| 1978 | Boston Red Sox | 104 | 0 | 4 | 0.2596 |
| 1979 | Boston Red Sox | 3 | 0 | 0 | 0.0000 |
| Year | Team | W | L | G | SHO |
|---|---|---|---|---|---|
| 1970 | Cincinnati Reds | 0 | 0 | 0 | 0 |
| 1971 | Cincinnati Reds | 0 | 0 | 0 | 0 |
| 1971 | San Francisco Giants | 0 | 0 | 0 | 0 |
| 1972 | Cleveland Indians | 0 | 0 | 0 | 0 |
| 1973 | Cleveland Indians | 0 | 0 | 0 | 0 |
| 1974 | Cleveland Indians | 0 | 0 | 0 | 0 |
| 1975 | Cleveland Indians | 0 | 0 | 0 | 0 |
| 1976 | Cleveland Indians | 0 | 0 | 0 | 0 |
| 1977 | Cleveland Indians | 0 | 0 | 0 | 0 |
| 1978 | Boston Red Sox | 0 | 0 | 0 | 0 |
| 1979 | Boston Red Sox | 0 | 0 | 0 | 0 |
| Year | Team | POS | E | DP | A |
|---|---|---|---|---|---|
| 1970 | Cincinnati Reds | SS | 0 | 4 | 12 |
| 1971 | Cincinnati Reds | SS | 2 | 5 | 24 |
| 1971 | San Francisco Giants | 2B | 0 | 0 | 1 |
| 1971 | San Francisco Giants | 3B | 0 | 0 | 1 |
| 1971 | San Francisco Giants | SS | 1 | 5 | 17 |
| 1972 | Cleveland Indians | SS | 13 | 75 | 360 |
| 1973 | Cleveland Indians | SS | 8 | 82 | 377 |
| 1974 | Cleveland Indians | SS | 15 | 83 | 491 |
| 1975 | Cleveland Indians | SS | 16 | 85 | 464 |
| 1976 | Cleveland Indians | SS | 10 | 83 | 344 |
| 1977 | Cleveland Indians | SS | 15 | 62 | 301 |
| 1978 | Boston Red Sox | 2B | 0 | 5 | 29 |
| 1978 | Boston Red Sox | 3B | 1 | 1 | 14 |
| 1978 | Boston Red Sox | SS | 7 | 13 | 55 |
| 1979 | Boston Red Sox | 1B | 0 | 0 | 0 |
| 1979 | Boston Red Sox | 2B | 0 | 0 | 2 |