STAT-ERA-SEP -- All players in database
Regular season
| Primary |
| Name | Name | ERA |
| Bobo Newsom | Blues | 1.57 |
| Bob Feller | Rugrats | 1.98 |
| Bucky Walters | Muck Dogs | 2.16 |
| Dutch Leonard | Panthers | 2.36 |
| Lefty Grove* | Grays | 2.36 |
| Charlie Root | Blues | 2.77 |
| Jim Tobin | Grays | 2.93 |
| Atley Donald | Mules | 2.93 |
| Bob Bowman | Tomahawks | 2.94 |
| Ted Lyons | Files | 2.95 |
| Red Ruffing | Panthers | 2.98 |
| Schoolboy Rowe | Muck Dogs | 2.98 |
| Dizzy Trout | Files | 3.08 |
| Claude Passeau | Arsenal | 3.24 |
| Denny Galehouse | Files | 3.26 |
| Dizzy Dean | Thunderbolts | 3.40 |
| Fritz Ostermueller* | Carp | 3.42 |
| Thornton Lee* | Rugrats | 3.44 |
| Mort Cooper | Royal Giants | 3.46 |
| Curt Davis | Muck Dogs | 3.50 |
| Willis Hudlin | Royal Giants | 3.52 |
| Johnny Rigney | Muck Dogs | 3.53 |
| Bill Dietrich | Blues | 3.60 |
| Kirby Higbe | Files | 3.61 |
| Ray Harrell | Blues | 3.66 |
| Bob Weiland* | Muck Dogs | 3.68 |
| Tot Pressnell | Hawks | 3.70 |
| Whitey Moore | Rugrats | 3.74 |
| Lefty Gomez* | Panthers | 3.75 |
| Monte Pearson | Thunderbolts | 3.78 |
| Bill McGee | Panthers | 3.81 |
| Paul Derringer | Grays | 3.83 |
| Tommy Bridges | Grays | 3.86 |
| Bill Posedel | Tomahawks | 3.87 |
| Jim Turner | Thunderbolts | 3.88 |
| Bill Lee | Grays | 3.89 |
| Jack Knott | Mules | 3.97 |
| Alex Carrasquel | Panthers | 3.99 |
| Lou Fette | Hawks | 4.05 |
| Johnny Allen | Thunderbolts | 4.07 |
| Ken Chase* | Carp | 4.07 |
| Joe Sullivan* | Tomahawks | 4.09 |
| Joe Bowman | Royal Giants | 4.10 |
| Joe Krakauskas* | Tomahawks | 4.13 |
| Mel Harder | Carp | 4.15 |
| Nels Potter | Royal Giants | 4.16 |
| Milt Shoffner* | Barons | 4.21 |
| Hugh Casey | Hawks | 4.24 |
| Johnny Marcum | Thunderbolts | 4.24 |
| Carl Hubbell* | Thunderbolts | 4.29 |
| Jack Wilson | Arsenal | 4.31 |
| Bump Hadley | Hawks | 4.31 |
| Larry French* | Panthers | 4.32 |
| Hal Schumacher | Tomahawks | 4.36 |
| Max Butcher | Carp | 4.45 |
| Harry Gumbert | Hawks | 4.48 |
| Vito Tamulis* | Carp | 4.49 |
| Fred Hutchinson | Royal Giants | 4.50 |
| Lee Grissom* | Blues | 4.56 |
| Luke Hamlin | Barons | 4.59 |
| Vance Page | Arsenal | 4.67 |
| Elden Auker | Arsenal | 4.74 |
| Manny Salvo | Blues | 4.76 |
| Lon Warneke | Barons | 4.87 |
| Al Milnar* | Barons | 4.95 |
| Cliff Melton* | Mules | 4.96 |
| Hugh Mulcahy | Arsenal | 5.00 |
| Boom-Boom Beck | Barons | 5.14 |
| Chubby Dean* | Carp | 5.20 |
| Johnny Vander Meer* | Carp | 5.32 |
| George Caster | Files | 5.35 |
| Freddy Fitzsimmons | Rugrats | 5.37 |
| Bill Lohrman | Rugrats | 5.45 |
| Vern Kennedy | Royal Giants | 5.61 |
| Bob Klinger | Mules | 5.65 |
| Danny MacFayden | Mules | 6.21 |