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Dennis Leonard played 12 major-league seasons (1974-1986) as a P (312). 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 | GS | W | L | SV | IP | SO | BB | ERA | ERA+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1974 | 23 | KCA | 5 | 4 | 0 | 4 | 0 | 22 | 8 | 12 | 5.32 | 68 |
| 1975 | 24 | KCA | 32 | 30 | 15 | 7 | 0 | 212.1 | 146 | 90 | 3.77 | 100 |
| 1976 | 25 | KCA | 35 | 34 | 17 | 10 | 0 | 259 | 150 | 70 | 3.51 | 100 |
| 1977 | 26 | KCA | 38 | 37 | 20 | 12 | 1 | 292.2 | 244 | 79 | 3.04 | 133 |
| 1978 | 27 | KCA | 40 | 40 | 21 | 17 | 0 | 294.2 | 183 | 78 | 3.33 | 113 |
| 1979 | 28 | KCA | 32 | 32 | 14 | 12 | 0 | 236 | 126 | 56 | 4.08 | 103 |
| 1980 | 29 | KCA | 38 | 38 | 20 | 11 | 0 | 280.1 | 155 | 80 | 3.79 | 106 |
| 1981 | 30 | KCA | 26 | 26 | 13 | 11 | 0 | 201.2 | 107 | 41 | 2.99 | 122 |
| 1982 | 31 | KCA | 21 | 21 | 10 | 6 | 0 | 130.2 | 58 | 46 | 5.10 | 80 |
| 1983 | 32 | KCA | 10 | 10 | 6 | 3 | 0 | 63 | 31 | 19 | 3.71 | 109 |
| 1985 | 34 | KCA | 2 | 0 | 0 | 0 | 0 | 2 | 1 | 0 | 0.00 | — |
| 1986 | 35 | KCA | 33 | 30 | 8 | 13 | 0 | 192.2 | 114 | 51 | 4.44 | 94 |
| Year | Pos | G | GS | PO | A | E | DP |
|---|---|---|---|---|---|---|---|
| 1974 | P | 5 | 4 | 3 | 7 | 0 | 1 |
| 1975 | P | 32 | 30 | 14 | 28 | 2 | 4 |
| 1976 | P | 35 | 34 | 11 | 23 | 6 | 2 |
| 1977 | P | 38 | 37 | 21 | 29 | 4 | 2 |
| 1978 | P | 40 | 40 | 16 | 43 | 1 | 2 |
| 1979 | P | 32 | 32 | 19 | 32 | 1 | 2 |
| 1980 | P | 38 | 38 | 9 | 41 | 1 | 4 |
| 1981 | P | 26 | 26 | 13 | 31 | 0 | 3 |
| 1982 | P | 21 | 21 | 16 | 18 | 3 | 2 |
| 1983 | P | 10 | 10 | 2 | 11 | 2 | 2 |
| 1985 | P | 2 | 0 | 0 | 0 | 0 | 0 |
| 1986 | P | 33 | 30 | 11 | 29 | 4 | 4 |
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 (3 ballot finishes, 0 wins). Full year pages: 1978, 1977.
| Year | Award | Lg | Rank | Points | First-place votes |
|---|---|---|---|---|---|
| 1977 | Cy Young Award | AL | 4 | 45 / 140 | 5 |
| 1977 | Most Valuable Player | AL | 31 | 1 / 392 | 0 |
| 1978 | Cy Young Award | AL | 9 | 1 / 140 | 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.