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Mariano Duncan played 12 major-league seasons (1985-1997) as a 2B (585), SS (540), OF (94), 3B (36), 1B (24). Career totals and every year-by-year line below come from the SABR/Lahman database (CC BY-SA), covering 1871-2025.
Showing 12 season lines
| Year | Age | Team | G | AB | R | H | HR | RBI | SB | BB | SO | AVG | OPS | OPS+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1985 | 22 | LAN | 142 | 562 | 74 | 137 | 6 | 39 | 38 | 38 | 113 | .244 | .633 | 83 |
| 1986 | 23 | LAN | 109 | 407 | 47 | 93 | 8 | 30 | 48 | 30 | 78 | .229 | .589 | 69 |
| 1987 | 24 | LAN | 76 | 261 | 31 | 56 | 6 | 18 | 11 | 17 | 62 | .215 | .589 | 61 |
| 1989 | 26 | LAN|CIN | 94 | 258 | 32 | 64 | 3 | 21 | 9 | 8 | 51 | .248 | .641 | 89 |
| 1990 | 27 | CIN | 125 | 435 | 67 | 133 | 10 | 55 | 13 | 24 | 67 | .306 | .821 | 132 |
| 1991 | 28 | CIN | 100 | 333 | 46 | 86 | 12 | 40 | 5 | 12 | 57 | .258 | .699 | 101 |
| 1992 | 29 | PHI | 142 | 574 | 71 | 153 | 8 | 50 | 23 | 17 | 108 | .267 | .680 | 98 |
| 1993 | 30 | PHI | 124 | 496 | 68 | 140 | 11 | 73 | 6 | 12 | 88 | .282 | .721 | 97 |
| 1994 | 31 | PHI | 88 | 347 | 49 | 93 | 8 | 48 | 10 | 17 | 72 | .268 | .713 | 90 |
| 1995 | 32 | PHI|CIN | 81 | 265 | 36 | 76 | 6 | 36 | 1 | 5 | 62 | .287 | .720 | 93 |
| 1996 | 33 | NYA | 109 | 400 | 62 | 136 | 8 | 56 | 4 | 9 | 77 | .340 | .852 | 113 |
| 1997 | 34 | NYA|TOR | 89 | 339 | 36 | 80 | 1 | 25 | 6 | 12 | 78 | .236 | .554 | 46 |
| Year | Pos | G | GS | PO | A | E | DP |
|---|---|---|---|---|---|---|---|
| 1985 | SS | 123 | 120 | 174 | 386 | 27 | 57 |
| 1985 | 2B | 19 | 16 | 50 | 44 | 3 | 7 |
| 1986 | SS | 106 | 106 | 172 | 317 | 25 | 46 |
| 1987 | SS | 67 | 62 | 90 | 191 | 21 | 37 |
| 1987 | 2B | 7 | 4 | 11 | 22 | 0 | 3 |
| 1987 | OF | 2 | 1 | 0 | 0 | 0 | 0 |
| 1989 | SS | 60 | 52 | 84 | 134 | 11 | 25 |
| 1989 | 2B | 13 | 6 | 13 | 21 | 2 | 5 |
| 1989 | OF | 7 | 1 | 4 | 0 | 1 | 0 |
| 1990 | 2B | 115 | 108 | 245 | 287 | 15 | 51 |
| 1990 | SS | 12 | 5 | 16 | 16 | 3 | 4 |
| 1990 | OF | 1 | 1 | 4 | 0 | 0 | 0 |
| 1991 | 2B | 62 | 58 | 116 | 144 | 7 | 29 |
| 1991 | SS | 32 | 22 | 46 | 68 | 2 | 12 |
| 1991 | OF | 7 | 5 | 7 | 0 | 0 | 0 |
| 1992 | OF | 65 | 58 | 123 | 1 | 3 | 0 |
| 1992 | 2B | 52 | 50 | 94 | 126 | 7 | 27 |
| 1992 | SS | 42 | 26 | 37 | 80 | 5 | 16 |
| 1992 | 3B | 4 | 3 | 2 | 3 | 1 | 0 |
| 1993 | 2B | 65 | 61 | 109 | 168 | 9 | 29 |
| 1993 | SS | 59 | 49 | 71 | 136 | 12 | 21 |
| 1994 | 2B | 37 | 34 | 76 | 100 | 5 | 23 |
| 1994 | 3B | 28 | 28 | 16 | 42 | 4 | 2 |
| 1994 | SS | 19 | 19 | 30 | 44 | 3 | 13 |
| 1994 | 1B | 6 | 3 | 25 | 2 | 0 | 1 |
| 1995 | 2B | 31 | 28 | 63 | 73 | 6 | 20 |
| 1995 | SS | 20 | 12 | 22 | 64 | 3 | 11 |
| 1995 | 1B | 18 | 12 | 122 | 6 | 2 | 11 |
| 1995 | OF | 3 | 3 | 6 | 0 | 0 | 0 |
| 1995 | 3B | 1 | 1 | 2 | 2 | 0 | 0 |
| 1996 | 2B | 104 | 98 | 183 | 238 | 11 | 57 |
| 1996 | 3B | 3 | 3 | 1 | 1 | 1 | 1 |
| 1996 | OF | 3 | 1 | 3 | 0 | 0 | 0 |
| 1997 | 2B | 80 | 78 | 139 | 210 | 7 | 44 |
| 1997 | OF | 6 | 6 | 7 | 1 | 1 | 0 |
Team codes are the source codes (e.g. NYN for the New York Mets, BS1 for the 1875 Boston club). OPS+ is league-season normalized, not park-adjusted; unrecorded source values (such as RBI in the earliest recorded seasons) are absent, never zero-filled.
MVP, Cy Young and Rookie of the Year voting history (2 ballot finishes, 0 wins). Full year pages: 1985.
| Year | Award | Lg | Rank | Points | First-place votes |
|---|---|---|---|---|---|
| 1985 | Most Valuable Player | NL | 23 | 1 / 336 | 0 |
| 1985 | Rookie of the Year | NL | 3 | 9 / 120 | 0 |
Every career total and season line is computed from the SABR / Sean Lahman baseball database (2025 edition, CC BY-SA 3.0), the same source behind our historical position leaderboards. Rate stats use league-season normalization only (OPS+ and ERA+ as marked, never park-adjusted); unrecorded early-era values stay absent rather than being invented. Career totals sum only what the source records.
Award winners and MVP / Cy Young / Rookie of the Year voting history come from the same database; the year pages live under MLB award voting history. Official transactions (2011 to the current season) come from the MLB StatsAPI feed on our transactions archive.