Single Season Losses Leaders
| Rank | Player | Year | Team | W | L | W-L% | ERA | G | GS | GF | CG | SH | SV | SV% | IP | BB | SO | WHIP | BR9 | HR9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Billy Powell | 1949 | SSL | 12 | 22 | .353 | 4.78 | 43 | 38 | 5 | 6 | 0 | 0 | 0 | 246.2 | 119 | 120 | 1.561 | 14.05 | 0.99 |
| 2 | Dazzy Vance | 1927 | MNL | 10 | 20 | .333 | 3.07 | 39 | 34 | 5 | 13 | 3 | 0 | 0 | 272.2 | 77 | 175 | 1.133 | 10.20 | 0.40 |
| Lee Meadows | 1927 | CIR | 13 | 20 | .394 | 3.51 | 40 | 40 | 0 | 14 | 0 | 0 | 0 | 297.1 | 83 | 77 | 1.305 | 11.74 | 0.54 | |
| Warren Spahn | 1949 | SSL | 11 | 20 | .355 | 3.94 | 36 | 36 | 0 | 19 | 3 | 0 | 0 | 285.2 | 109 | 155 | 1.386 | 12.48 | 0.66 | |
| 5 | Jesse Haines | 1927 | IMG | 16 | 19 | .457 | 3.36 | 49 | 36 | 13 | 14 | 1 | 4 | 67 | 297.1 | 92 | 92 | 1.291 | 11.62 | 0.39 |
| Jack Kralick | 1961 | BBS | 6 | 19 | .240 | 4.66 | 31 | 31 | 0 | 7 | 2 | 0 | 0 | 218.1 | 57 | 123 | 1.392 | 12.53 | 1.20 | |
| 7 | Jesse Petty | 1927 | GTL | 16 | 18 | .471 | 3.02 | 40 | 36 | 4 | 14 | 1 | 0 | 0 | 283.1 | 74 | 103 | 1.214 | 10.93 | 0.29 |
| Darryl Kile | 1997 | CIR | 11 | 18 | .379 | 4.32 | 41 | 41 | 0 | 1 | 0 | 0 | 0 | 256 | 148 | 189 | 1.457 | 13.11 | 1.09 | |
| J.r. Richard | 1977 | BBS | 11 | 18 | .379 | 4.40 | 34 | 34 | 0 | 11 | 2 | 0 | 0 | 268 | 108 | 207 | 1.287 | 11.59 | 1.21 | |
| Jimmy Key | 1997 | CIR | 7 | 18 | .280 | 4.46 | 36 | 36 | 0 | 0 | 0 | 0 | 0 | 212 | 84 | 139 | 1.528 | 13.75 | 0.93 | |
| Vic Raschi | 1949 | CIR | 13 | 18 | .419 | 4.79 | 43 | 43 | 0 | 6 | 0 | 0 | 0 | 298.2 | 194 | 137 | 1.610 | 14.49 | 0.63 | |
| Robert McClure | 1927 | PBP | 10 | 18 | .357 | 4.82 | 49 | 35 | 14 | 5 | 1 | 1 | 100 | 240.2 | 118 | 53 | 1.546 | 13.91 | 0.30 | |
| 13 | Mel Parnell | 1949 | BRI | 20 | 17 | .541 | 3.35 | 40 | 40 | 0 | 18 | 5 | 0 | 0 | 322.1 | 134 | 133 | 1.350 | 12.15 | 0.47 |
| Ellis Kinder | 1949 | TAF | 11 | 17 | .393 | 3.80 | 36 | 33 | 3 | 8 | 3 | 1 | 50 | 241.2 | 88 | 149 | 1.283 | 11.54 | 0.97 | |
| Ed Lopat | 1949 | BRI | 9 | 17 | .346 | 4.14 | 37 | 36 | 1 | 2 | 0 | 0 | 0 | 230.1 | 99 | 68 | 1.459 | 13.13 | 0.63 | |
| Yellowhorse Morris | 1927 | SSL | 9 | 17 | .346 | 4.17 | 36 | 33 | 3 | 7 | 0 | 0 | 0 | 215.2 | 102 | 62 | 1.567 | 14.11 | 0.46 | |
| Madison Bumgarner | 2015 | GTL | 9 | 17 | .346 | 4.17 | 30 | 30 | 0 | 4 | 1 | 0 | 0 | 211.2 | 45 | 218 | 1.294 | 11.65 | 1.06 | |
| Dave Mcnally | 1974 | BBC | 3 | 17 | .150 | 4.43 | 34 | 34 | 0 | 1 | 0 | 0 | 0 | 189 | 75 | 93 | 1.550 | 13.95 | 0.95 | |
| Russ Meyer | 1949 | SSL | 7 | 17 | .292 | 4.94 | 34 | 29 | 5 | 6 | 0 | 1 | 100 | 200.1 | 92 | 74 | 1.502 | 13.52 | 1.03 | |
| Jerry Reuss | 1977 | BBS | 5 | 17 | .227 | 5.20 | 32 | 32 | 0 | 0 | 0 | 0 | 0 | 180 | 72 | 112 | 1.611 | 14.50 | 1.00 | |
| Rufus Lewis | 1949 | MNL | 10 | 17 | .370 | 5.82 | 37 | 34 | 3 | 4 | 1 | 1 | 100 | 227.1 | 94 | 116 | 1.579 | 14.21 | 1.23 | |
| 22 | Burleigh Grimes | 1927 | SSL | 16 | 16 | .500 | 2.65 | 46 | 32 | 14 | 5 | 2 | 0 | 0 | 258 | 94 | 115 | 1.291 | 11.62 | 0.42 |
| Lefty Grove | 1927 | SRR | 14 | 16 | .467 | 2.99 | 73 | 26 | 47 | 5 | 2 | 4 | 50 | 274.1 | 128 | 184 | 1.436 | 12.93 | 0.20 | |
| Nolan Ryan | 1977 | SRR | 16 | 16 | .500 | 3.26 | 37 | 37 | 0 | 10 | 0 | 0 | 0 | 268 | 206 | 298 | 1.474 | 13.26 | 0.47 | |
| Jeff Fassero | 1997 | HRH | 12 | 16 | .429 | 3.82 | 33 | 33 | 0 | 4 | 2 | 0 | 0 | 224 | 77 | 161 | 1.250 | 11.25 | 0.80 | |
| Warren Spahn | 1961 | SUS | 9 | 16 | .360 | 4.07 | 30 | 28 | 2 | 5 | 1 | 0 | 0 | 181.1 | 60 | 81 | 1.417 | 12.76 | 1.29 | |
| Chris Holt | 1997 | HRH | 6 | 16 | .273 | 4.10 | 31 | 31 | 0 | 0 | 0 | 0 | 0 | 184.1 | 61 | 89 | 1.297 | 11.67 | 1.03 | |
| Lefty Lamarque | 1949 | GTL | 15 | 16 | .484 | 4.15 | 41 | 41 | 0 | 12 | 2 | 0 | 0 | 297.1 | 80 | 110 | 1.339 | 12.05 | 0.64 | |
| Jack Banta | 1949 | PVA | 9 | 16 | .360 | 4.29 | 77 | 0 | 77 | 0 | 0 | 22 | 67 | 121.2 | 70 | 75 | 1.471 | 13.24 | 0.96 | |
| Big Bill Foster | 1927 | SSL | 10 | 16 | .385 | 4.34 | 34 | 33 | 1 | 8 | 0 | 0 | 0 | 221.2 | 133 | 90 | 1.674 | 15.06 | 0.45 | |
| Rube Walberg | 1927 | GTL | 9 | 16 | .360 | 4.75 | 38 | 29 | 9 | 5 | 3 | 2 | 50 | 217.2 | 99 | 103 | 1.475 | 13.27 | 0.54 | |
| David Wells | 1997 | TLF | 10 | 16 | .385 | 5.43 | 34 | 34 | 0 | 1 | 1 | 0 | 0 | 192.1 | 52 | 126 | 1.466 | 13.20 | 1.40 | |
| Doyle Alexander | 1977 | SSL | 11 | 16 | .407 | 5.76 | 36 | 36 | 0 | 3 | 0 | 0 | 0 | 211 | 96 | 91 | 1.682 | 15.14 | 1.49 | |
| 34 | Frank Lary | 1961 | SUS | 12 | 15 | .444 | 2.82 | 30 | 29 | 1 | 9 | 5 | 0 | 0 | 214 | 61 | 107 | 1.131 | 10.18 | 0.46 |
| Gready McKinnis | 1949 | SSL | 11 | 15 | .423 | 2.83 | 32 | 32 | 0 | 9 | 0 | 0 | 0 | 229 | 75 | 103 | 1.162 | 10.45 | 0.51 | |
| Virgil Trucks | 1949 | PVA | 13 | 15 | .464 | 3.52 | 39 | 37 | 2 | 15 | 0 | 1 | 100 | 289 | 128 | 156 | 1.277 | 11.49 | 0.69 | |
| Rick Sutcliffe | 1987 | BCD | 11 | 15 | .423 | 3.52 | 31 | 31 | 0 | 4 | 1 | 0 | 0 | 217.1 | 104 | 151 | 1.380 | 12.42 | 0.95 | |
| Milt Gaston | 1927 | MIT | 8 | 15 | .348 | 3.74 | 46 | 32 | 14 | 2 | 0 | 0 | 0 | 202.1 | 72 | 64 | 1.334 | 12.01 | 0.49 | |
| Joey Jay | 1961 | SRR | 10 | 15 | .400 | 3.85 | 32 | 31 | 1 | 5 | 2 | 0 | 0 | 196.1 | 91 | 126 | 1.396 | 12.56 | 1.15 | |
| Dave Goltz | 1977 | DIN | 16 | 15 | .516 | 3.88 | 41 | 41 | 0 | 5 | 0 | 0 | 0 | 294.1 | 106 | 183 | 1.277 | 11.50 | 0.76 | |
| Hal Newhouser | 1949 | TAF | 14 | 15 | .483 | 4.13 | 46 | 33 | 13 | 11 | 1 | 5 | 100 | 268 | 104 | 142 | 1.340 | 12.06 | 0.94 | |
| Bob Feller | 1949 | TAF | 9 | 15 | .375 | 4.21 | 36 | 30 | 6 | 4 | 0 | 0 | 0 | 226.2 | 85 | 121 | 1.416 | 12.75 | 0.60 | |
| Virgil Barnes | 1927 | TLF | 9 | 15 | .375 | 4.23 | 32 | 32 | 0 | 0 | 0 | 0 | 0 | 198 | 65 | 59 | 1.545 | 13.91 | 0.32 | |
| Ron Guidry | 1977 | CIR | 7 | 15 | .318 | 4.23 | 35 | 29 | 6 | 5 | 0 | 1 | 50 | 204.1 | 91 | 179 | 1.419 | 12.77 | 0.97 | |
| Denny Neagle | 1997 | TLF | 9 | 15 | .375 | 4.36 | 34 | 34 | 0 | 1 | 1 | 0 | 0 | 223 | 45 | 163 | 1.157 | 10.41 | 1.41 | |
| Dave Stewart | 1987 | SRR | 7 | 15 | .318 | 4.42 | 33 | 33 | 0 | 2 | 1 | 0 | 0 | 212 | 103 | 192 | 1.401 | 12.61 | 0.98 | |
| Vern Bickford | 1949 | BRI | 13 | 15 | .464 | 4.46 | 38 | 38 | 0 | 3 | 1 | 0 | 0 | 252.1 | 115 | 129 | 1.403 | 12.63 | 0.64 | |
| Jim Bibby | 1974 | SEP | 7 | 15 | .318 | 4.91 | 32 | 32 | 0 | 3 | 0 | 0 | 0 | 176 | 97 | 91 | 1.551 | 13.96 | 1.28 | |
| Rats Henderson | 1927 | TLF | 9 | 15 | .375 | 4.95 | 30 | 26 | 4 | 0 | 0 | 2 | 100 | 171 | 24 | 29 | 1.439 | 12.95 | 0.84 | |
| Tom Zachary | 1927 | BRI | 5 | 15 | .250 | 6.92 | 38 | 22 | 16 | 0 | 0 | 1 | 50 | 135.1 | 57 | 25 | 1.899 | 17.09 | 0.47 | |
| 51 | David Price | 2015 | PVD | 9 | 14 | .391 | 2.87 | 32 | 32 | 0 | 1 | 0 | 0 | 0 | 213 | 42 | 214 | 1.169 | 10.52 | 0.46 |
| Jack Quinn | 1927 | TBK | 8 | 14 | .364 | 2.93 | 30 | 26 | 4 | 7 | 2 | 0 | 0 | 193.1 | 62 | 48 | 1.407 | 12.66 | 0.37 | |
| Jim Palmer | 1977 | IMG | 16 | 14 | .533 | 3.38 | 38 | 38 | 0 | 6 | 0 | 0 | 0 | 288 | 107 | 205 | 1.205 | 10.84 | 0.97 | |
| Johnny Cueto | 2015 | BRI | 7 | 14 | .333 | 3.57 | 33 | 32 | 1 | 2 | 0 | 0 | 0 | 211.2 | 54 | 177 | 1.252 | 11.27 | 1.11 | |
| Felix Hernandez | 2015 | QCK | 13 | 14 | .481 | 3.70 | 30 | 30 | 0 | 2 | 0 | 0 | 0 | 199.2 | 60 | 198 | 1.187 | 10.68 | 1.13 | |
| Don Cardwell | 1961 | THD | 15 | 14 | .517 | 3.76 | 36 | 36 | 0 | 4 | 4 | 0 | 0 | 248.2 | 95 | 150 | 1.307 | 11.76 | 1.05 | |
| Al Benton | 1949 | PBP | 13 | 14 | .481 | 3.78 | 82 | 0 | 82 | 0 | 0 | 27 | 68 | 104.2 | 51 | 31 | 1.586 | 14.27 | 0.60 | |
| Tal Strong | 1927 | CIR | 14 | 14 | .500 | 3.79 | 36 | 35 | 1 | 5 | 2 | 0 | 0 | 249.1 | 93 | 37 | 1.336 | 12.02 | 0.36 | |
| Rick Reuschel | 1977 | BBS | 12 | 14 | .462 | 3.85 | 38 | 38 | 0 | 2 | 0 | 0 | 0 | 243 | 74 | 163 | 1.296 | 11.67 | 0.48 | |
| Hoyt Wilhelm | 1961 | THD | 8 | 14 | .364 | 3.88 | 66 | 0 | 66 | 0 | 0 | 21 | 68 | 109 | 51 | 74 | 1.440 | 12.96 | 0.83 | |
| Eppa Rixey | 1927 | TBK | 9 | 14 | .391 | 3.99 | 39 | 28 | 11 | 5 | 0 | 0 | 0 | 201 | 48 | 41 | 1.493 | 13.43 | 0.40 | |
| Paul Splittorff | 1974 | SEP | 10 | 14 | .417 | 4.06 | 32 | 32 | 0 | 1 | 0 | 0 | 0 | 193 | 59 | 75 | 1.373 | 12.36 | 0.98 | |
| Jay Heard | 1949 | CIR | 16 | 14 | .533 | 4.07 | 44 | 44 | 0 | 3 | 0 | 0 | 0 | 307.2 | 110 | 138 | 1.297 | 11.67 | 0.82 | |
| Jim Bibby | 1977 | MNL | 10 | 14 | .417 | 4.10 | 34 | 33 | 1 | 0 | 0 | 0 | 0 | 204 | 99 | 145 | 1.510 | 13.59 | 0.88 | |
| Tyson Ross | 2015 | PFW | 12 | 14 | .462 | 4.12 | 31 | 31 | 0 | 0 | 0 | 0 | 0 | 185.2 | 77 | 201 | 1.212 | 10.91 | 0.87 | |
| Jim Bunning | 1961 | BBS | 12 | 14 | .462 | 4.12 | 32 | 32 | 0 | 9 | 3 | 0 | 0 | 233.2 | 70 | 143 | 1.262 | 11.36 | 1.54 | |
| Don Newcombe | 1949 | MNL | 15 | 14 | .517 | 4.16 | 37 | 34 | 3 | 11 | 1 | 0 | 0 | 255.1 | 96 | 155 | 1.449 | 13.04 | 0.81 | |
| John Lackey | 2015 | PFW | 12 | 14 | .462 | 4.18 | 33 | 33 | 0 | 2 | 0 | 0 | 0 | 217.1 | 64 | 145 | 1.238 | 11.14 | 1.08 | |
| Scott Kazmir | 2015 | MNL | 6 | 14 | .300 | 4.34 | 30 | 30 | 0 | 0 | 0 | 0 | 0 | 178.1 | 70 | 138 | 1.335 | 12.01 | 0.96 | |
| Rudy May | 1977 | TLF | 9 | 14 | .391 | 4.36 | 32 | 32 | 0 | 0 | 0 | 0 | 0 | 198.1 | 67 | 96 | 1.286 | 11.57 | 0.91 | |
| Groundhog Thompson | 1949 | BRI | 13 | 14 | .481 | 4.47 | 34 | 33 | 1 | 3 | 0 | 0 | 0 | 221.2 | 58 | 69 | 1.389 | 12.51 | 0.65 | |
| Noah Syndergaard | 2015 | MNL | 5 | 14 | .263 | 4.52 | 23 | 23 | 0 | 0 | 0 | 0 | 0 | 147.1 | 39 | 148 | 1.229 | 11.06 | 1.53 | |
| Vida Blue | 1977 | SSL | 9 | 14 | .391 | 4.61 | 35 | 35 | 0 | 4 | 1 | 0 | 0 | 230.1 | 76 | 139 | 1.363 | 12.27 | 1.56 | |
| Pat Hentgen | 1997 | CIR | 9 | 14 | .391 | 4.68 | 41 | 41 | 0 | 1 | 1 | 0 | 0 | 244 | 76 | 157 | 1.357 | 12.21 | 1.44 | |
| Jerry Augustine | 1977 | GTL | 8 | 14 | .364 | 4.81 | 28 | 28 | 0 | 0 | 0 | 0 | 0 | 181.1 | 48 | 64 | 1.395 | 12.56 | 0.94 | |
| Alex Fernandez | 1997 | TLF | 7 | 14 | .333 | 4.83 | 34 | 34 | 0 | 0 | 0 | 0 | 0 | 207 | 88 | 172 | 1.473 | 13.26 | 1.78 | |
| Jon Lester | 2015 | GTL | 5 | 14 | .263 | 4.86 | 26 | 26 | 0 | 1 | 0 | 0 | 0 | 174 | 41 | 181 | 1.328 | 11.95 | 1.14 | |
| Garrett Richards | 2015 | MNL | 11 | 14 | .440 | 5.07 | 32 | 32 | 0 | 0 | 0 | 0 | 0 | 198.2 | 80 | 152 | 1.379 | 12.41 | 1.49 | |
| Sam Streeter | 1927 | MWB | 16 | 14 | .533 | 5.11 | 38 | 38 | 0 | 15 | 1 | 0 | 0 | 288.2 | 84 | 103 | 1.510 | 13.59 | 0.62 | |
| Esteban Loaiza | 1997 | GTL | 10 | 14 | .417 | 5.46 | 31 | 31 | 0 | 2 | 1 | 0 | 0 | 191.1 | 63 | 106 | 1.443 | 12.98 | 1.46 | |
| Johnny Sain | 1949 | DIN | 8 | 14 | .364 | 5.74 | 33 | 33 | 0 | 1 | 1 | 0 | 0 | 169.1 | 59 | 52 | 1.654 | 14.88 | 0.85 | |
| Mark Lemongello | 1977 | COL | 7 | 14 | .333 | 5.78 | 37 | 37 | 0 | 0 | 0 | 0 | 0 | 176 | 78 | 91 | 1.790 | 16.11 | 0.82 | |
| Andy Ashby | 1997 | QCK | 5 | 14 | .263 | 6.18 | 33 | 33 | 0 | 0 | 0 | 0 | 0 | 185 | 61 | 132 | 1.551 | 13.96 | 1.17 | |
| Mike Torrez | 1977 | CIR | 8 | 14 | .364 | 8.13 | 31 | 31 | 0 | 1 | 0 | 0 | 0 | 166 | 78 | 92 | 1.928 | 17.35 | 1.84 | |
| 85 | Jake Arrieta | 2015 | BRI | 14 | 13 | .519 | 2.43 | 31 | 31 | 0 | 5 | 3 | 0 | 0 | 229.1 | 59 | 224 | 0.977 | 8.79 | 0.63 |
| Dennis Leonard | 1977 | MIT | 17 | 13 | .567 | 2.83 | 59 | 27 | 32 | 6 | 0 | 6 | 60 | 260.2 | 87 | 221 | 1.162 | 10.46 | 0.79 | |
| Clifford Carter | 1927 | MIT | 13 | 13 | .500 | 2.88 | 36 | 35 | 1 | 2 | 1 | 0 | 0 | 212.2 | 69 | 46 | 1.227 | 11.05 | 0.63 | |
| Charlie Root | 1927 | GTL | 19 | 13 | .594 | 2.99 | 40 | 39 | 1 | 19 | 3 | 0 | 0 | 322.1 | 131 | 146 | 1.198 | 10.78 | 0.53 | |
| Waite Hoyt | 1927 | BRI | 15 | 13 | .536 | 3.08 | 34 | 34 | 0 | 13 | 2 | 0 | 0 | 257 | 55 | 112 | 1.183 | 10.65 | 0.53 | |
| Matt Harvey | 2015 | CIR | 10 | 13 | .435 | 3.43 | 29 | 29 | 0 | 0 | 0 | 0 | 0 | 189 | 57 | 171 | 1.212 | 10.90 | 1.05 | |
| Whitey Ford | 1961 | SUS | 9 | 13 | .409 | 3.44 | 29 | 29 | 0 | 4 | 0 | 0 | 0 | 183.1 | 67 | 129 | 1.151 | 10.36 | 0.69 | |
| Ted Lyons | 1927 | BUM | 23 | 13 | .639 | 3.46 | 84 | 14 | 70 | 5 | 1 | 4 | 50 | 312 | 77 | 80 | 1.333 | 12.00 | 0.35 | |
| Verdell Mathis | 1949 | QCK | 9 | 13 | .409 | 3.58 | 54 | 18 | 36 | 6 | 0 | 3 | 75 | 208.2 | 131 | 65 | 1.476 | 13.28 | 0.56 | |
| Ed Figueroa | 1977 | BUM | 14 | 13 | .519 | 3.59 | 38 | 38 | 0 | 2 | 0 | 0 | 0 | 238 | 81 | 97 | 1.324 | 11.91 | 0.72 | |
| Larry Dierker | 1974 | CIR | 9 | 13 | .409 | 3.86 | 26 | 25 | 1 | 4 | 0 | 0 | 0 | 170.1 | 84 | 116 | 1.321 | 11.89 | 1.00 | |
| Don Gullett | 1974 | GTL | 7 | 13 | .350 | 3.89 | 26 | 26 | 0 | 8 | 3 | 0 | 0 | 196.2 | 67 | 149 | 1.246 | 11.21 | 1.10 | |
| Howie Pollet | 1949 | MNL | 12 | 13 | .480 | 3.89 | 40 | 31 | 9 | 6 | 1 | 0 | 0 | 249.2 | 77 | 135 | 1.374 | 12.36 | 0.68 | |
| Tom Seaver | 1974 | LVS | 11 | 13 | .458 | 3.94 | 27 | 27 | 0 | 4 | 1 | 0 | 0 | 185 | 60 | 160 | 1.319 | 11.87 | 1.07 | |
| Ken Heintzelman | 1949 | SPS | 16 | 13 | .552 | 3.97 | 46 | 39 | 7 | 3 | 2 | 0 | 0 | 244.2 | 104 | 81 | 1.377 | 12.40 | 0.74 | |
| Luther Farrell | 1927 | BUM | 17 | 13 | .567 | 3.98 | 43 | 43 | 0 | 9 | 1 | 0 | 0 | 283 | 77 | 72 | 1.360 | 12.24 | 0.51 |