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| Given Name: | John Duffield |
| Birth Date: | 1948-3-9 |
| Birth City: | Newton |
| Birth Country: | |
| Height: | 73 cm |
| Weight: | 175 kg |
| Bats: | Left |
| Throws: | Left |
| Age: | 78 |
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1970 Boston Red Sox | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | P | 0 | 0 | 2 | |
| 1971 Boston Red Sox | 0.111 | 1 | 9 | 0 | 0 | 2 | 2 | 5 | 19 | 0 | P | 0 | 0 | 1 |
| 1972 Boston Red Sox | 0.094 | 5 | 53 | 0 | 1 | 11 | 8 | 26 | 106 | 3 | P | 2 | 4 | 23 |
| 1973 Boston Red Sox | 0 | 0 | 0 | 0 | 13 | 13 | 35 | 101 | 4 | P | 2 | 1 | 33 | |
| 1974 St. Louis Cardinals | 0.159 | 10 | 63 | 0 | 2 | 10 | 14 | 33 | 89 | 2 | P | 0 | 2 | 31 |
| 1975 St. Louis Cardinals | 0.211 | 8 | 38 | 0 | 1 | 8 | 9 | 39 | 67 | 0 | P | 1 | 3 | 31 |
| 1976 St. Louis Cardinals | 0.200 | 7 | 35 | 0 | 0 | 6 | 11 | 37 | 52 | 1 | P | 0 | 1 | 22 |
| 1977 San Francisco Giants | 0.231 | 3 | 13 | 0 | 0 | 3 | 3 | 43 | 47 | 1 | P | 0 | 3 | 14 |
| 1978 San Francisco Giants | 0.000 | 0 | 2 | 0 | 0 | 4 | 3 | 46 | 38 | 0 | P | 2 | 1 | 9 |
| 1979 San Francisco Giants | 0.147 | 5 | 34 | 0 | 3 | 10 | 9 | 27 | 85 | 2 | P | 0 | 1 | 13 |
| 1980 San Diego Padres | 0.194 | 12 | 62 | 0 | 2 | 10 | 8 | 30 | 71 | 0 | P | 1 | 2 | 37 |
| 1981 San Diego Padres | 0.077 | 1 | 13 | 0 | 2 | 2 | 6 | 28 | 31 | 0 | P | 1 | 1 | 12 |
| 1982 California Angels | 0 | 0 | 0 | 0 | 0 | 1 | 8 | 10 | 0 | P | 0 | 0 | 1 | |
| 1982 San Diego Padres | 0.297 | 11 | 37 | 0 | 5 | 8 | 6 | 26 | 54 | 1 | P | 2 | 1 | 17 |
| 1983 California Angels | 0 | 0 | 0 | 0 | 1 | 2 | 37 | 36 | 0 | P | 1 | 1 | 10 | |
| 1984 California Angels | 0 | 0 | 0 | 0 | 1 | 2 | 17 | 18 | 0 | P | 0 | 0 | 4 |