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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 |
| Gregg | Jefferies | Gregory Scott | 1967 | 8 | 1 | Burlingame | USA | 71 | 175 | -1968 | B | R |
| Year | Team | AB | HR | RBI | BA |
|---|---|---|---|---|---|
| 1987 | New York Mets | 6 | 0 | 2 | 0.5000 |
| 1988 | New York Mets | 109 | 6 | 17 | 0.3211 |
| 1989 | New York Mets | 508 | 12 | 56 | 0.2579 |
| 1990 | New York Mets | 604 | 15 | 68 | 0.2831 |
| 1991 | New York Mets | 486 | 9 | 62 | 0.2716 |
| 1992 | Kansas City Royals | 604 | 10 | 75 | 0.2848 |
| 1993 | St. Louis Cardinals | 544 | 16 | 83 | 0.3419 |
| 1994 | St. Louis Cardinals | 397 | 12 | 55 | 0.3249 |
| 1995 | Philadelphia Phillies | 480 | 11 | 56 | 0.3063 |
| 1996 | Philadelphia Phillies | 404 | 7 | 51 | 0.2921 |
| 1997 | Philadelphia Phillies | 476 | 11 | 48 | 0.2563 |
| 1998 | Anaheim Angels | 72 | 1 | 10 | 0.3472 |
| 1998 | Philadelphia Phillies | 483 | 8 | 48 | 0.2940 |
| 1999 | Detroit Tigers | 205 | 6 | 18 | 0.2000 |
| 2000 | Detroit Tigers | 142 | 2 | 14 | 0.2746 |
| Year | Team | W | L | G | SHO |
|---|---|---|---|---|---|
| 1987 | New York Mets | 0 | 0 | 0 | 0 |
| 1988 | New York Mets | 0 | 0 | 0 | 0 |
| 1989 | New York Mets | 0 | 0 | 0 | 0 |
| 1990 | New York Mets | 0 | 0 | 0 | 0 |
| 1991 | New York Mets | 0 | 0 | 0 | 0 |
| 1992 | Kansas City Royals | 0 | 0 | 0 | 0 |
| 1993 | St. Louis Cardinals | 0 | 0 | 0 | 0 |
| 1994 | St. Louis Cardinals | 0 | 0 | 0 | 0 |
| 1995 | Philadelphia Phillies | 0 | 0 | 0 | 0 |
| 1996 | Philadelphia Phillies | 0 | 0 | 0 | 0 |
| 1997 | Philadelphia Phillies | 0 | 0 | 0 | 0 |
| 1998 | Anaheim Angels | 0 | 0 | 0 | 0 |
| 1998 | Philadelphia Phillies | 0 | 0 | 0 | 0 |
| 1999 | Detroit Tigers | 0 | 0 | 0 | 0 |
| 2000 | Detroit Tigers | 0 | 0 | 0 | 0 |
| Year | Team | POS | E | DP | A |
|---|---|---|---|---|---|
| 1987 | New York Mets | 0 | 0 | 0 | |
| 1988 | New York Mets | 2B | 1 | 4 | 16 |
| 1988 | New York Mets | 3B | 1 | 5 | 30 |
| 1989 | New York Mets | 2B | 12 | 41 | 254 |
| 1989 | New York Mets | 3B | 2 | 3 | 26 |
| 1990 | New York Mets | 2B | 12 | 49 | 278 |
| 1990 | New York Mets | 3B | 4 | 5 | 63 |
| 1991 | New York Mets | 2B | 6 | 15 | 177 |
| 1991 | New York Mets | 3B | 11 | 6 | 94 |
| 1992 | Kansas City Royals | 2B | 0 | 0 | 0 |
| 1992 | Kansas City Royals | 3B | 26 | 22 | 304 |
| 1993 | St. Louis Cardinals | 1B | 9 | 114 | 76 |
| 1993 | St. Louis Cardinals | 2B | 0 | 1 | 1 |
| 1994 | St. Louis Cardinals | 1B | 7 | 94 | 53 |
| 1995 | Philadelphia Phillies | 1B | 3 | 53 | 33 |
| 1995 | Philadelphia Phillies | OF | 0 | 1 | 3 |
| 1996 | Philadelphia Phillies | 1B | 1 | 38 | 38 |
| 1996 | Philadelphia Phillies | OF | 0 | 0 | 1 |
| 1997 | Philadelphia Phillies | OF | 3 | 2 | 5 |
| 1998 | Anaheim Angels | 1B | 0 | 2 | 2 |
| 1998 | Anaheim Angels | OF | 0 | 0 | 0 |
| 1998 | Philadelphia Phillies | OF | 1 | 0 | 7 |
| 1999 | Detroit Tigers | 1B | 0 | 1 | 4 |
| 1999 | Detroit Tigers | 2B | 0 | 0 | 1 |
| 1999 | Detroit Tigers | OF | 0 | 0 | 0 |
| 2000 | Detroit Tigers | 1B | 1 | 18 | 15 |
| 2000 | Detroit Tigers | 2B | 0 | 6 | 33 |
| 2000 | Detroit Tigers | 3B | 0 | 1 | 4 |
| 2000 | Detroit Tigers | OF | 0 | 0 | 0 |