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| Given Name: | Frederick Duff |
| Birth Date: | 1879-7-14 |
| Birth City: | Perth Amboy |
| Birth Country: | |
| Height: | 71 cm |
| Weight: | 190 kg |
| Bats: | Right |
| Throws: | Left |
| Age: | 72(Deceased) |
| Teams and Years | Batting Average | Hits | At Bats | Home Runs | Runs Batted In | Wins | Losses | Games Pitched In | Strikeouts | Shutouts | Position | Errors | Double Plays | Assists |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1903 Philadelphia Phillies | 0.188 | 3 | 16 | 0 | 1 | 0 | 3 | 6 | 12 | 0 | P | 3 | 0 | 13 |
| 1907 Boston Americans | 0.200 | 1 | 5 | 0 | 0 | 0 | 1 | 2 | 6 | 0 | P | 0 | 0 | 2 |
| 1908 Boston Red Sox | 0.246 | 17 | 69 | 0 | 5 | 10 | 8 | 31 | 94 | 0 | P | 8 | 0 | 48 |
| 1909 Boston Red Sox | 0.158 | 3 | 19 | 0 | 1 | 3 | 3 | 10 | 12 | 0 | P | 3 | 1 | 21 |