STAT-ERA-SEP -- All players in database
Regular season
| Primary |
| Name | Name | ERA |
| Mort Cooper | Royal Giants | 1.83 |
| Cliff Melton* | Grays | 1.93 |
| Johnny Vander Meer* | Carp | 1.98 |
| Johnny Beazley | Royal Giants | 2.24 |
| Tex Hughson | Carp | 2.41 |
| Hal Newhouser* | Panthers | 2.48 |
| Hank Borowy | Thunderbolts | 2.54 |
| Ernie White* | Grays | 2.55 |
| Johnny Niggeling | Arsenal | 2.55 |
| Bucky Walters | Grays | 2.63 |
| Max Lanier* | Rugrats | 2.64 |
| Hal Schumacher | Panthers | 2.65 |
| Ernie Bonham | Stampers | 2.66 |
| Ray Starr | Royal Giants | 2.68 |
| Red Ruffing | Hawks | 2.71 |
| Ted Lyons | Natti Bohs | 2.86 |
| Charlie Wagner | Royal Giants | 2.86 |
| Tommy Bridges | Natti Bohs | 2.87 |
| Al Benton | Hawks | 2.88 |
| Junior Thompson | Hudys | 2.92 |
| Mel Harder | Panthers | 2.96 |
| Dutch Dietz | Muck Dogs | 2.99 |
| Hal White | Panthers | 3.01 |
| Johnny Humphries | Rugrats | 3.03 |
| Rip Sewell | Aces | 3.06 |
| Whit Wyatt | Carp | 3.06 |
| Larry French* | Thunderbolts | 3.09 |
| Marv Breuer | Thunderbolts | 3.18 |
| Jim Tobin | Grays | 3.22 |
| Kirby Higbe | Natti Bohs | 3.26 |
| Joe Dobson | Carp | 3.28 |
| Elden Auker | Arsenal | 3.30 |
| Sid Hudson | Blues | 3.30 |
| Harry Gumbert | Hawks | 3.31 |
| Al Smith* | Aces | 3.35 |
| Carl Hubbell* | Thunderbolts | 3.36 |
| Bobo Newsom | Blues | 3.37 |
| Dizzy Trout | Natti Bohs | 3.39 |
| Claude Passeau | Arsenal | 3.43 |
| Alex Carrasquel | Thunderbolts | 3.44 |
| Spud Chandler | Grays | 3.47 |
| Virgil Trucks | Arsenal | 3.50 |
| Elmer Riddle | Rugrats | 3.52 |
| Lou Tost* | Hawks | 3.56 |
| Curt Davis | Rugrats | 3.63 |
| Phil Marchildon | Blues | 3.64 |
| Lon Warneke | Grays | 3.65 |
| Jim Bagby | Stampers | 3.69 |
| Tommy Hughes | Muck Dogs | 3.71 |
| Dick Newsome | Rugrats | 3.72 |
| Ken Heintzelman* | Thunderbolts | 3.78 |
| Bob Klinger | Aces | 3.89 |
| Paul Derringer | Hudys | 3.91 |
| Bill Lee | Hawks | 3.91 |
| Rube Melton | Aces | 3.94 |
| Al Javery | Muck Dogs | 3.95 |
| Bob Harris | Stampers | 3.96 |
| Eddie Smith* | Muck Dogs | 4.06 |
| Johnny Podgajny | Stampers | 4.22 |
| Russ Christopher | Muck Dogs | 4.23 |
| Roger Wolff | Panthers | 4.38 |
| Bill Dietrich | Blues | 4.39 |
| Al Milnar* | Hudys | 4.39 |
| Atley Donald | Aces | 4.52 |
| Howie Pollet* | Hudys | 4.57 |
| Tom Earley | Muck Dogs | 4.83 |
| Chubby Dean* | Stampers | 4.85 |
| Orval Grove | Blues | 4.89 |
| Si Johnson | Aces | 4.95 |
| Walt Masterson | Aces | 5.00 |
| Johnny Allen | Thunderbolts | 5.51 |
| Tom Sunkel* | Hudys | 6.44 |