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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 |
| Jim | Mason | James Percy | 1950 | 8 | 14 | Mobile | USA | 74 | 185 | -1951 | L | R |
| Year | Team | AB | HR | RBI | BA |
|---|---|---|---|---|---|
| 1971 | Washington Senators | 9 | 0 | 0 | 0.3333 |
| 1972 | Texas Rangers | 147 | 0 | 10 | 0.1973 |
| 1973 | Texas Rangers | 238 | 3 | 19 | 0.2059 |
| 1974 | New York Yankees | 440 | 5 | 37 | 0.2500 |
| 1975 | New York Yankees | 223 | 2 | 16 | 0.1525 |
| 1976 | New York Yankees | 217 | 1 | 14 | 0.1797 |
| 1977 | Texas Rangers | 55 | 1 | 7 | 0.2182 |
| 1977 | Toronto Blue Jays | 79 | 0 | 2 | 0.1646 |
| 1978 | Texas Rangers | 105 | 0 | 3 | 0.1905 |
| 1979 | Montreal Expos | 71 | 0 | 6 | 0.1831 |
| Year | Team | W | L | G | SHO |
|---|---|---|---|---|---|
| 1971 | Washington Senators | 0 | 0 | 0 | 0 |
| 1972 | Texas Rangers | 0 | 0 | 0 | 0 |
| 1973 | Texas Rangers | 0 | 0 | 0 | 0 |
| 1974 | New York Yankees | 0 | 0 | 0 | 0 |
| 1975 | New York Yankees | 0 | 0 | 0 | 0 |
| 1976 | New York Yankees | 0 | 0 | 0 | 0 |
| 1977 | Texas Rangers | 0 | 0 | 0 | 0 |
| 1977 | Toronto Blue Jays | 0 | 0 | 0 | 0 |
| 1978 | Texas Rangers | 0 | 0 | 0 | 0 |
| 1979 | Montreal Expos | 0 | 0 | 0 | 0 |
| Year | Team | POS | E | DP | A |
|---|---|---|---|---|---|
| 1971 | Washington Senators | SS | 1 | 1 | 13 |
| 1972 | Texas Rangers | 3B | 2 | 0 | 13 |
| 1972 | Texas Rangers | SS | 8 | 14 | 93 |
| 1973 | Texas Rangers | 2B | 2 | 8 | 24 |
| 1973 | Texas Rangers | 3B | 0 | 0 | 0 |
| 1973 | Texas Rangers | SS | 18 | 43 | 206 |
| 1974 | New York Yankees | SS | 25 | 87 | 430 |
| 1975 | New York Yankees | 2B | 0 | 0 | 0 |
| 1975 | New York Yankees | SS | 16 | 45 | 209 |
| 1976 | New York Yankees | SS | 13 | 47 | 245 |
| 1977 | Texas Rangers | 3B | 1 | 0 | 0 |
| 1977 | Texas Rangers | SS | 2 | 11 | 57 |
| 1977 | Toronto Blue Jays | SS | 3 | 9 | 51 |
| 1978 | Texas Rangers | 2B | 0 | 0 | 0 |
| 1978 | Texas Rangers | 3B | 2 | 2 | 13 |
| 1978 | Texas Rangers | SS | 8 | 12 | 79 |
| 1979 | Montreal Expos | 3B | 0 | 1 | 9 |
| 1979 | Montreal Expos | SS | 3 | 9 | 53 |