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Don McMahon played 18 major-league seasons (1957-1974) as a P (874). Career totals and every year-by-year line below come from the SABR/Lahman database (CC BY-SA), covering 1871-2025.
Showing 18 season lines
| Year | Age | Team | G | AB | R | H | HR | RBI | SB | BB | SO | AVG | OPS | OPS+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1957 | 27 | ML1 | 32 | 8 | 1 | 2 | 0 | 3 | 0 | 2 | 2 | .250 | .775 | 117 |
| 1958 | 28 | ML1 | 38 | 9 | 0 | 1 | 0 | 0 | 0 | 2 | 6 | .111 | .384 | 10 |
| 1959 | 29 | ML1 | 60 | 9 | 2 | 2 | 0 | 0 | 0 | 1 | 5 | .222 | .522 | 47 |
| 1960 | 30 | ML1 | 48 | 11 | 0 | 0 | 0 | 1 | 0 | 0 | 5 | .000 | .000 | -100 |
| 1961 | 31 | ML1 | 53 | 16 | 1 | 3 | 0 | 1 | 0 | 0 | 4 | .188 | .438 | 19 |
| 1962 | 32 | ML1|HOU | 53 | 12 | 0 | 1 | 0 | 0 | 0 | 0 | 4 | .083 | .167 | -53 |
| 1963 | 33 | HOU | 49 | 12 | 1 | 1 | 0 | 0 | 0 | 2 | 5 | .083 | .381 | 16 |
| 1964 | 34 | CLE | 70 | 14 | 1 | 2 | 0 | 1 | 0 | 0 | 8 | .143 | .286 | -17 |
| 1965 | 35 | CLE | 58 | 9 | 0 | 2 | 0 | 0 | 0 | 0 | 5 | .222 | .444 | 31 |
| 1966 | 36 | CLE|BOS | 61 | 13 | 0 | 1 | 0 | 1 | 0 | 1 | 7 | .077 | .297 | -12 |
| 1967 | 37 | BOS|CHA | 63 | 13 | 0 | 2 | 0 | 0 | 0 | 0 | 10 | .154 | .308 | -6 |
| 1968 | 38 | CHA|DET | 45 | 7 | 0 | 1 | 0 | 0 | 0 | 0 | 3 | .143 | .286 | -10 |
| 1969 | 39 | DET | 34 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | .000 | .000 | -100 |
| 1969 | 39 | SFN | 13 | 3 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | .333 | .667 | 94 |
| 1970 | 40 | SFN | 61 | 14 | 1 | 2 | 0 | 1 | 0 | 2 | 9 | .143 | .393 | 12 |
| 1971 | 41 | SFN | 61 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | .000 | .000 | -100 |
| 1972 | 42 | SFN | 44 | 4 | 0 | 1 | 0 | 0 | 0 | 0 | 2 | .250 | .500 | 48 |
| 1973 | 43 | SFN | 22 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 1.000 | 2.000 | 477 |
| Year | Age | Team | G | GS | W | L | SV | IP | SO | BB | ERA | ERA+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1957 | 27 | ML1 | 32 | 0 | 2 | 3 | 9 | 46.2 | 46 | 29 | 1.54 | 251 |
| 1958 | 28 | ML1 | 38 | 0 | 7 | 2 | 8 | 58.2 | 37 | 29 | 3.68 | 107 |
| 1959 | 29 | ML1 | 60 | 0 | 5 | 3 | 15 | 80.2 | 55 | 37 | 2.57 | 154 |
| 1960 | 30 | ML1 | 48 | 0 | 3 | 6 | 10 | 63.2 | 50 | 32 | 5.94 | 63 |
| 1961 | 31 | ML1 | 53 | 0 | 6 | 4 | 8 | 92 | 55 | 51 | 2.84 | 142 |
| 1962 | 32 | ML1|HOU | 53 | 0 | 5 | 6 | 8 | 79.2 | 72 | 33 | 1.69 | 233 |
| 1963 | 33 | HOU | 49 | 2 | 1 | 5 | 5 | 80 | 51 | 26 | 4.05 | 81 |
| 1964 | 34 | CLE | 70 | 0 | 6 | 4 | 16 | 101 | 92 | 52 | 2.41 | 151 |
| 1965 | 35 | CLE | 58 | 0 | 3 | 3 | 11 | 85 | 60 | 37 | 3.28 | 105 |
| 1966 | 36 | CLE|BOS | 61 | 0 | 9 | 8 | 10 | 90.1 | 62 | 44 | 2.69 | 128 |
| 1967 | 37 | BOS|CHA | 63 | 0 | 6 | 2 | 5 | 109.1 | 84 | 40 | 1.98 | 164 |
| 1968 | 38 | CHA|DET | 45 | 0 | 5 | 2 | 1 | 81.2 | 65 | 30 | 1.98 | 150 |
| 1969 | 39 | DET | 34 | 0 | 3 | 5 | 11 | 37 | 38 | 18 | 3.89 | 93 |
| 1969 | 39 | SFN | 13 | 0 | 3 | 1 | 2 | 23.2 | 21 | 9 | 3.04 | 118 |
| 1970 | 40 | SFN | 61 | 0 | 9 | 5 | 19 | 94.1 | 74 | 45 | 2.96 | 137 |
| 1971 | 41 | SFN | 61 | 0 | 10 | 6 | 4 | 82 | 71 | 37 | 4.06 | 85 |
| 1972 | 42 | SFN | 44 | 0 | 3 | 3 | 5 | 63 | 45 | 21 | 3.71 | 93 |
| 1973 | 43 | SFN | 22 | 0 | 4 | 0 | 6 | 30.1 | 20 | 7 | 1.48 | 247 |
| 1974 | 44 | SFN | 9 | 0 | 0 | 0 | 0 | 11.2 | 5 | 2 | 3.09 | 117 |
| Year | Pos | G | GS | PO | A | E | DP |
|---|---|---|---|---|---|---|---|
| 1957 | P | 32 | 0 | 1 | 5 | 1 | 1 |
| 1958 | P | 38 | 0 | 5 | 7 | 1 | 0 |
| 1959 | P | 60 | 0 | 4 | 10 | 2 | 0 |
| 1960 | P | 48 | 0 | 1 | 13 | 1 | 0 |
| 1961 | P | 53 | 0 | 7 | 23 | 3 | 1 |
| 1962 | P | 53 | 0 | 4 | 11 | 0 | 0 |
| 1963 | P | 49 | 2 | 5 | 12 | 1 | 2 |
| 1964 | P | 70 | 0 | 5 | 10 | 0 | 0 |
| 1965 | P | 58 | 0 | 10 | 15 | 0 | 3 |
| 1966 | P | 61 | 0 | 7 | 10 | 0 | 1 |
| 1967 | P | 63 | 0 | 7 | 16 | 1 | 1 |
| 1968 | P | 45 | 0 | 3 | 8 | 0 | 0 |
| 1969 | P | 47 | 0 | 0 | 11 | 0 | 1 |
| 1970 | P | 61 | 0 | 8 | 9 | 0 | 0 |
| 1971 | P | 61 | 0 | 8 | 14 | 0 | 1 |
| 1972 | P | 44 | 0 | 4 | 7 | 0 | 1 |
| 1973 | P | 22 | 0 | 3 | 5 | 0 | 0 |
| 1974 | P | 9 | 0 | 1 | 1 | 0 | 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.
Don McMahon ranks on 1 all-time single-season position leaderboard (1871-2025, league-season-normalized OPS+ / ERA+).
| Rank | Board | Year | Stat |
|---|---|---|---|
| #108 | relief pitchers | 1962 | 233 ERA+ |
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.