This
Beyond the Box Score post mentions Mariano Rivera's seventy-seven strikeouts and six walks last season and how his 12.83 K/BB ratio is stunningly high. As a commenter on that post revealed, Dennis Eckersley is the only reliever ever to record a higher ratio in 50 or more innings pitched. Eck had ratios of 18.33 and 18.25 in 1989 and 1990, respectively, with 128 strikeouts against seven walks in the two seasons combined. In fact, only two other pitchers had better ratios than Eckersley. Both pitched in the nineteenth century and both had, suspiciously, only one base on balls allowed. In 1879, Fred Goldsmith struck out 31 batters in 63 innings for Troy of the National League. In 1882, Bert Dorr struck out 34 batters in 66 innings for St. Louis of the American Association. Given the relatively fluid rules and the vagaries of record-keeping back then, I don't think it's unreasonable to discount Goldsmith and Dorr.
But even if you count Goldsmith and Dorr, there's no such controversy on the other end of the list. The all-time worst K/BB among pitchers with 50+ IP in a season belongs to Ted Wingfield. After a couple seasons as a reliable swingman who didn't strike many people out for the Red Sox, Wingfield totally lost his strikeout ability in 1927. In 74 2/3 innings, Wingfield went 1-7 with a 5.06 ERA. He also issued 27 walks against only
one strikeout, good for a 0.04 K/BB. He wasn't the only pitcher to struggle in that era, as a look at the ten worst K/BB since 1901 shows.
Worst K/BB Since 1901, Minimum 50 IP
| Name | Team | IP | K | BB | K:BB |
|---|
| Ted Wingfield | 1927 BOS | 74.2 | 1 | 27 | .037 |
| Ray Moss | 1928 BRO | 60.1 | 5 | 35 | .143 |
| Jack Berly | 1933 PHI | 50.0 | 4 | 22 | .182 |
| Skinny Graham | 1929 DET | 51.2 | 7 | 33 | .212 |
| Jack Dunn | 1901 PHI/BLA | 64.1 | 6 | 28 | .214 |
| Dewey Metivier | 1923 CLE | 73.1 | 9 | 38 | .237 |
| Les Sweetland | 1928 PHI | 135.1 | 23 | 97 | .237 |
| Bob Kline | 1933 BOS | 127.0 | 16 | 67 | .239 |
| Joe Coleman | 1950 PHA | 54.0 | 12 | 50 | .240 |
| Norman Plitt | 1927 BRO/NYG | 69.7 | 9 | 37 | .243 |
The combination of low strikeout and high walk rates in both major leagues was lethal to these guys. For a more recent feel, let's turn to the worst K:BB rates of the last 10 years:
Worst K/BB Since 1999, Minimum 50 IP
| Name | Team | IP | K | BB | K:BB |
|---|
Dan Serafini
| 1999 CHC
| 62.1
| 17
| 32
| .531 |
Kirk Rueter
| 2005 SFG
| 107.1
| 25
| 47
| .532 |
Scott Erickson
| 2005 LAD
| 55.1 | 15
| 25 | .600 |
Steve Avery
| 1999 CIN
| 96.0
| 51
| 78
| .654 |
Russ Ortiz
| 2005 ARI
| 115.0
| 46
| 65
| .708 |
Dewon Brazelton
| 2005 TBD
| 71.0 | 43
| 60
| .717 |
Steve Trachsel
| 2007 BAL/CHC
| 158.0 | 56
| 76
| .737 |
Jimmy Anderson
| 2002 PIT
| 140.2 | 47
| 63
| .746 |
Aaron Cook
| 2003 COL
| 124.0
| 43
| 57
| .754 |
Ken Cloude
| 1999 SEA
| 72.1
| 35
| 46
| .761 |
Both 1999 and 2005 show up three times on the list. If you're curious, here are the six major leaguers with 50+ IP and a K:BB of 1.000 or lower in 2008:
- Tom Glavine, ATL, 37 K, 37 BB, 1.000
- Tom Gorzelanny, PIT, 67 K, 70 BB, .957
- Miguel Batista, SEA, 73 K, 79 BB, .924
- Greg Reynolds, COL, 22 K, 26 BB, .846
- Kason Gabbard, TEX, 33 K, 39 BB, .846
- Fausto Carmona, CLE, 58 K, 70 BB, .829