Since 1962, 5 pitchers were tied for losing the most games by a starting pitcher in a season, with 22 games. The first three are Steve Rogers in 1974, Denny McLain in 1971 and Dick Ellsworth in 1966.
| NAME | L | SEASON | TM | W | L% | G | W% | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | K/9 | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | H/9 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | S. Rogers | 22 | 1974 | 15 | .595 | 38 | .405 | 38 | 4.47 | 154 | 11 | 1 | 0 | 253.2 | 255 | 126 | 139 | 19 | 80 | 5 | 0 | 7 | 1,065 | 7 | 5.46 | 2.84 | 1.93 | 0.67 | 14.5 | 7.5 | 1.32 | .292 | 4.93 | 9.05 | |
| 2 | | D. McLain | 22 | 1971 | 9 | .710 | 32 | .290 | 32 | 4.32 | 100 | 9 | 3 | 0 | 212.2 | 230 | 102 | 114 | 31 | 70 | 3 | 0 | 8 | 914 | 4 | 4.23 | 2.96 | 1.43 | 1.31 | 10.9 | 7.7 | 1.41 | .280 | 4.82 | 9.73 | |
| 3 | | D. Ellsworth | 22 | 1966 | 8 | .733 | 37 | .267 | 37 | 3.90 | 144 | 9 | 0 | 0 | 268.0 | 318 | 116 | 146 | 27 | 50 | 5 | 0 | 5 | 1,161 | 5 | 4.84 | 1.68 | 2.88 | 0.91 | 12.4 | 4.3 | 1.37 | .311 | 4.90 | 10.68 | |
| 4 | | J. Fisher | 22 | 1965 | 8 | .733 | 36 | .267 | 36 | 4.00 | 110 | 10 | 0 | 0 | 243.0 | 242 | 108 | 118 | 21 | 63 | 4 | 0 | 6 | 1,007 | 6 | 4.07 | 2.33 | 1.75 | 0.78 | 10.9 | 6.3 | 1.26 | .273 | 4.37 | 8.96 | |
| 5 | | R. Craig | 22 | 1962 | 6 | .786 | 33 | .214 | 33 | 4.68 | 112 | 13 | 0 | 0 | 223.0 | 254 | 116 | 130 | 34 | 64 | 7 | 0 | 2 | 953 | 6 | 4.52 | 2.58 | 1.75 | 1.37 | 11.8 | 6.7 | 1.43 | .299 | 5.25 | 10.25 | |
| 6 | | M. Maroth | 21 | 2003 | 9 | .700 | 33 | .300 | 33 | 5.73 | 87 | 1 | 0 | 0 | 193.1 | 231 | 123 | 131 | 34 | 50 | 8 | 0 | 2 | 847 | 7 | 4.05 | 2.33 | 1.74 | 1.58 | 10.3 | 5.9 | 1.45 | .295 | 6.10 | 10.75 | |
| 7 | | R. Jones | 21 | 1974 | 8 | .724 | 34 | .276 | 34 | 4.51 | 116 | 4 | 1 | 0 | 197.2 | 207 | 99 | 114 | 16 | 73 | 5 | 0 | 9 | 864 | 4 | 5.28 | 3.32 | 1.59 | 0.73 | 13.4 | 8.4 | 1.42 | .292 | 5.19 | 9.42 | |
| 8 | | M. Lolich | 21 | 1974 | 16 | .568 | 41 | .432 | 41 | 4.15 | 202 | 27 | 3 | 0 | 308.0 | 310 | 142 | 155 | 38 | 78 | 3 | 0 | 11 | 1,263 | 10 | 5.90 | 2.28 | 2.59 | 1.11 | 16.0 | 6.2 | 1.26 | .289 | 4.53 | 9.06 | |
| 9 | | S. Bahnsen | 21 | 1973 | 18 | .538 | 42 | .462 | 42 | 3.57 | 120 | 14 | 4 | 0 | 282.1 | 290 | 112 | 128 | 20 | 117 | 5 | 0 | 2 | 1,217 | 10 | 3.83 | 3.73 | 1.03 | 0.64 | 9.9 | 9.6 | 1.44 | .283 | 4.08 | 9.24 | |
| 10 | | S. Arlin | 21 | 1972 | 9 | .700 | 37 | .300 | 37 | 3.61 | 158 | 12 | 3 | 0 | 249.0 | 217 | 100 | 115 | 19 | 120 | 9 | 0 | 14 | 1,067 | 15 | 5.71 | 4.34 | 1.32 | 0.69 | 14.8 | 11.2 | 1.35 | .260 | 4.16 | 7.84 | |
| 11 | | L. Jackson | 21 | 1965 | 14 | .600 | 39 | .400 | 39 | 3.85 | 131 | 12 | 4 | 0 | 257.1 | 268 | 110 | 126 | 28 | 57 | 5 | 0 | 8 | 1,079 | 5 | 4.58 | 1.99 | 2.30 | 0.98 | 12.1 | 5.3 | 1.26 | .280 | 4.41 | 9.37 | |
| 12 | | R. Craig | 21 | 1963 | 5 | .808 | 31 | .192 | 31 | 3.63 | 102 | 14 | 0 | 0 | 216.0 | 225 | 87 | 104 | 25 | 52 | 5 | 0 | 2 | 924 | 4 | 4.25 | 2.17 | 1.96 | 1.04 | 11.0 | 5.6 | 1.28 | .270 | 4.33 | 9.38 | |
| 13 | | P. Niekro | 20 | 1979 | 21 | .488 | 44 | .512 | 44 | 3.39 | 208 | 23 | 1 | 0 | 342.0 | 311 | 129 | 160 | 41 | 113 | 11 | 0 | 8 | 1,436 | 18 | 5.47 | 2.97 | 1.84 | 1.08 | 14.5 | 7.9 | 1.24 | .254 | 4.21 | 8.18 | |
| 14 | | J. Koosman | 20 | 1977 | 8 | .714 | 32 | .286 | 32 | 3.49 | 192 | 6 | 1 | 0 | 226.2 | 195 | 88 | 102 | 17 | 81 | 4 | 0 | 8 | 940 | 2 | 7.62 | 3.22 | 2.37 | 0.68 | 20.4 | 8.6 | 1.22 | .276 | 4.05 | 7.74 | |
| 15 | | P. Niekro | 20 | 1977 | 15 | .571 | 43 | .429 | 43 | 4.04 | 261 | 20 | 2 | 0 | 329.2 | 314 | 148 | 166 | 26 | 163 | 8 | 0 | 12 | 1,424 | 17 | 7.13 | 4.45 | 1.60 | 0.71 | 18.3 | 11.4 | 1.45 | .298 | 4.53 | 8.57 | |
| 16 | | W. Wood | 20 | 1975 | 16 | .556 | 43 | .444 | 43 | 4.11 | 140 | 14 | 2 | 0 | 291.1 | 309 | 133 | 148 | 26 | 92 | 5 | 0 | 5 | 1,245 | 6 | 4.32 | 2.84 | 1.52 | 0.80 | 11.2 | 7.4 | 1.38 | .288 | 4.57 | 9.55 | |
| 17 | | B. Bonham | 20 | 1974 | 10 | .667 | 36 | .333 | 36 | 3.92 | 187 | 10 | 2 | 0 | 236.2 | 240 | 103 | 130 | 13 | 107 | 6 | 0 | 7 | 1,051 | 12 | 7.11 | 4.07 | 1.75 | 0.49 | 17.8 | 10.2 | 1.47 | .308 | 4.94 | 9.13 | |
| 18 | | W. Wood | 20 | 1973 | 23 | .465 | 48 | .535 | 48 | 3.51 | 194 | 21 | 4 | 0 | 354.1 | 379 | 138 | 165 | 25 | 90 | 7 | 0 | 3 | 1,513 | 7 | 4.93 | 2.29 | 2.16 | 0.63 | 12.8 | 5.9 | 1.32 | .296 | 4.19 | 9.63 | |
| 19 |  | S. Carlton | 20 | 1973 | 13 | .606 | 40 | .394 | 40 | 3.90 | 223 | 18 | 3 | 0 | 293.1 | 293 | 127 | 146 | 29 | 113 | 3 | 0 | 12 | 1,261 | 7 | 6.84 | 3.47 | 1.97 | 0.89 | 17.7 | 9.0 | 1.38 | .296 | 4.48 | 8.99 | |
| 20 | | C. Kirby | 20 | 1969 | 7 | .741 | 35 | .259 | 35 | 3.84 | 113 | 2 | 0 | 0 | 215.2 | 204 | 92 | 109 | 18 | 100 | 6 | 0 | 12 | 931 | 7 | 4.72 | 4.17 | 1.13 | 0.75 | 12.1 | 10.7 | 1.41 | .268 | 4.55 | 8.51 | |
| 21 | | L. Tiant | 20 | 1969 | 9 | .690 | 37 | .310 | 37 | 3.73 | 155 | 9 | 1 | 0 | 248.1 | 227 | 103 | 123 | 37 | 129 | 8 | 0 | 11 | 1,087 | 0 | 5.62 | 4.68 | 1.20 | 1.34 | 14.3 | 11.9 | 1.43 | .251 | 4.46 | 8.23 | |
| 22 | | A. Jackson | 20 | 1965 | 8 | .714 | 31 | .286 | 31 | 4.45 | 112 | 7 | 3 | 0 | 194.1 | 207 | 96 | 108 | 17 | 59 | 8 | 0 | 3 | 840 | 6 | 5.19 | 2.73 | 1.90 | 0.79 | 13.3 | 7.0 | 1.37 | .295 | 5.00 | 9.59 | |
| 23 | | O. Pena | 20 | 1963 | 11 | .645 | 33 | .355 | 33 | 3.75 | 122 | 9 | 3 | 0 | 211.0 | 211 | 88 | 92 | 24 | 52 | 5 | 0 | 2 | 888 | 3 | 5.20 | 2.22 | 2.35 | 1.02 | 13.7 | 5.9 | 1.25 | .273 | 3.92 | 9.00 | |
| 24 | | A. Jackson | 20 | 1962 | 8 | .714 | 33 | .286 | 33 | 4.45 | 116 | 12 | 4 | 0 | 228.2 | 243 | 113 | 132 | 16 | 77 | 5 | 0 | 5 | 988 | 9 | 4.57 | 3.03 | 1.51 | 0.63 | 11.7 | 7.8 | 1.40 | .293 | 5.20 | 9.56 | |
| 25 |  | P. Corbin | 19 | 2022 | 6 | .760 | 31 | .240 | 31 | 6.31 | 128 | 1 | 0 | 0 | 152.2 | 210 | 107 | 119 | 27 | 49 | 7 | 0 | 1 | 713 | 2 | 7.55 | 2.89 | 2.61 | 1.59 | 18.0 | 6.9 | 1.70 | .365 | 7.02 | 12.38 | |
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WSHStatMuse has game-level data for pitcher losses going back to the 1901 season.
Some of the information used here was obtained free of charge from Retrosheet.
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| NL East | W | L | PCT | GB |
|---|---|---|---|---|
 Braves - y | 94 | 68 | .580 | |
 Phillies - w | 88 | 74 | .543 | 6.0 |
80 | 82 | .494 | 14.0 | |
77 | 85 | .475 | 17.0 | |
74 | 88 | .457 | 20.0 | |
| NL Central | W | L | PCT | GB |
 Brewers - y | 103 | 59 | .636 | |
 Cubs - w | 89 | 73 | .549 | 14.0 |
82 | 80 | .506 | 21.0 | |
77 | 85 | .475 | 26.0 | |
75 | 87 | .463 | 28.0 | |
| NL West | W | L | PCT | GB |
 Dodgers - y | 100 | 62 | .617 | |
 Padres - w | 91 | 71 | .562 | 9.0 |
86 | 76 | .531 | 14.0 | |
65 | 97 | .401 | 35.0 | |
58 | 104 | .358 | 42.0 |
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Cardinals
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Diamondbacks
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Rockies| AL East | W | L | PCT | GB |
|---|---|---|---|---|
 Rays - y | 98 | 64 | .605 | |
 Yankees - w | 93 | 68 | .578 | 4.5 |
 Red Sox - w | 87 | 75 | .537 | 11.0 |
79 | 82 | .491 | 18.5 | |
79 | 83 | .488 | 19.0 | |
| AL Central | W | L | PCT | GB |
 Guardians - y | 85 | 77 | .525 | |
 White Sox - w | 84 | 78 | .519 | 1.0 |
77 | 85 | .475 | 8.0 | |
76 | 86 | .469 | 9.0 | |
69 | 93 | .426 | 16.0 | |
| AL West | W | L | PCT | GB |
 Astros - y | 81 | 81 | .500 | |
80 | 82 | .494 | 1.0 | |
76 | 86 | .469 | 5.0 | |
64 | 98 | .395 | 17.0 | |
62 | 100 | .383 | 19.0 |
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