STAT-ERA-SEP -- All players in database
Regular season
| Primary |
| Name | Name | ERA |
| Luis Tiant | Forest Citys | 1.74 |
| Gaylord Perry | Rats | 1.90 |
| Buzz Capra | Thunder | 2.06 |
| Al Fitzmorris | Rats | 2.10 |
| Andy Messersmith | Cubs | 2.13 |
| Fergie Jenkins | Tourists | 2.36 |
| Bert Blyleven | Mountaineers | 2.48 |
| Jon Matlack* | G's | 2.50 |
| Phil Niekro | Saxons | 2.52 |
| Catfish Hunter | Thunder | 2.54 |
| Tom Seaver | Rats | 2.55 |
| Bruce DalCanton | Chiefs | 2.55 |
| Woodie Fryman* | Phillies | 2.67 |
| Rudy May* | Triangles | 2.68 |
| Dennis Blair | Tourists | 2.68 |
| Jim Barr | Spiders | 2.77 |
| Jim Lonborg | Volcanoes | 2.81 |
| John D'Acquisto | Red Storm | 2.84 |
| Jim Colborn | Black Sox | 2.88 |
| Dave Hamilton* | Black Sox | 2.93 |
| Steve Busby | Tigers | 3.04 |
| Mike Torrez | Volcanoes | 3.07 |
| Burt Hooton | Mountaineers | 3.11 |
| Pat Dobson | Peppers | 3.11 |
| Ken Holtzman* | Forest Citys | 3.12 |
| Dock Ellis | Stars | 3.16 |
| Nolan Ryan | Phillies | 3.16 |
| Jim Perry | Cubs | 3.18 |
| Vida Blue* | Thunder | 3.20 |
| Wilbur Wood* | Thunder | 3.21 |
| Steve Renko | Eagles | 3.28 |
| Bruce Kison | Replacements | 3.29 |
| Bart Johnson | Dukes | 3.31 |
| Jim Kaat* | Cubs | 3.32 |
| Bob Forsch | Dukes | 3.32 |
| Paul Splittorff* | Phillies | 3.34 |
| Dick Ruthven | Tourists | 3.34 |
| Doc Medich | Chiefs | 3.35 |
| Bob Gibson | Stars | 3.39 |
| Steve Hargan | Peppers | 3.40 |
| Tommy John* | Peppers | 3.41 |
| Dave Roberts* | Mountaineers | 3.41 |
| Tom Griffin | G's | 3.42 |
| Ernie McAnally | Replacements | 3.43 |
| Dan Spillner | Eagles | 3.49 |
| Bill Greif | Rats | 3.49 |
| Jerry Koosman* | Thunder | 3.52 |
| Ron Schueler | Tourists | 3.57 |
| Dave McNally* | Cubs | 3.58 |
| Larry Dierker | G's | 3.61 |
| Ken Brett* | Rats | 3.64 |
| Alan Foster | Replacements | 3.65 |
| Rick Reuschel | Moondogs | 3.68 |
| Doug Rau* | Black Sox | 3.70 |
| Ron Reed | Tourists | 3.71 |
| Mike Caldwell* | Saxons | 3.71 |
| Mickey Lolich* | Spiders | 3.73 |
| Dave Freisleben | Tigers | 3.74 |
| Don Gullett* | Dukes | 3.74 |
| Stan Bahnsen | Spiders | 3.75 |
| Andy Hassler* | Mountaineers | 3.75 |
| Joe Decker | G's | 3.77 |
| Joe Coleman | Forest Citys | 3.86 |
| Jim Slaton | Stars | 3.87 |
| Fred Norman* | Eagles | 3.88 |
| Bill Lee* | Peppers | 3.89 |
| Jack Billingham | Mountaineers | 3.90 |
| Jim Rooker* | Volcanoes | 3.95 |
| Ross Grimsley* | Forest Citys | 4.01 |
| Lynn McGlothen | Dukes | 4.02 |
| Carl Morton | Volcanoes | 4.08 |
| Reggie Cleveland | Tigers | 4.14 |
| Glenn Abbott | G's | 4.17 |
| Lerrin LaGrow | Triangles | 4.21 |
| Steve Rogers | Dukes | 4.21 |
| Roger Moret* | Black Sox | 4.22 |
| Dick Drago | Triangles | 4.26 |
| Dave Pagan | Saxons | 4.28 |
| Kevin Kobel* | Mountaineers | 4.29 |
| John Curtis* | Phillies | 4.31 |
| Frank Tanana* | Black Sox | 4.38 |
| Bill Bonham | Eagles | 4.39 |
| Clyde Wright* | Moondogs | 4.44 |
| Dave Goltz | Phillies | 4.45 |
| Jackie Brown | Eagles | 4.49 |
| Don Sutton | Chiefs | 4.50 |
| Randy Jones* | Tigers | 4.50 |
| Steve Carlton* | Triangles | 4.51 |
| Sonny Siebert | Replacements | 4.62 |
| Clay Kirby | Triangles | 4.67 |
| Dick Tidrow | Spiders | 4.76 |
| Jerry Reuss* | Red Storm | 4.81 |
| Tom Bradley | Moondogs | 4.82 |
| Roric Harrison | Red Storm | 4.83 |
| Don Wilson | Replacements | 5.03 |
| Steve Stone | Replacements | 5.04 |
| Claude Osteen* | Peppers | 5.20 |
| Fritz Peterson* | Red Storm | 5.40 |
| Bill Stoneman | Red Storm | 5.40 |
| Mike Cuellar* | Chiefs | 5.44 |
| Ray Sadecki* | Moondogs | 5.92 |
| David Clyde* | Moondogs | 7.56 |