STAT-ERA-SEP -- All players in database
Regular season
| Primary |
| Name | Name | ERA |
| Lynn McGlothen | Tourists | 1.54 |
| Jim Kaat* | Cubs | 1.55 |
| Bob Gibson | Stars | 1.58 |
| Rick Reuschel | Bombers | 1.67 |
| Burt Hooton | Mountaineers | 1.93 |
| Gaylord Perry | Rats | 2.04 |
| Gary Nolan | Red Storm | 2.05 |
| Scipio Spinks | Bombers | 2.05 |
| Bill Hands | Tigers | 2.09 |
| Don Wilson | Thunder | 2.12 |
| Jon Matlack* | Stallions | 2.15 |
| Phil Niekro | Saxons | 2.22 |
| Milt Pappas | Rats | 2.24 |
| Roger Nelson | Tigers | 2.25 |
| Dick Woodson | Volcanoes | 2.27 |
| Jim McAndrew | | 2.29 |
| Dock Ellis | Stars | 2.33 |
| Reggie Cleveland | Stars | 2.43 |
| Catfish Hunter | Thunder | 2.44 |
| Fergie Jenkins | Tourists | 2.50 |
| Jim Perry | Cubs | 2.53 |
| Bill Singer | Stars | 2.54 |
| Nelson Briles | Volcanoes | 2.55 |
| Nolan Ryan | Cougars | 2.56 |
| Jerry Reuss* | Red Storm | 2.56 |
| Mickey Lolich* | Spiders | 2.58 |
| Steve Kline | Stallions | 2.61 |
| Mike Torrez | Volcanoes | 2.62 |
| Tom Timmermann | Triangles | 2.62 |
| Larry Dierker | Stallions | 2.64 |
| Mike Hedlund | Stallions | 2.66 |
| Ray Corbin | Cubs | 2.67 |
| Joe Coleman | Forest Citys | 2.67 |
| Bill Stoneman | Black Sox | 2.80 |
| Wilbur Wood* | Thunder | 2.86 |
| Tom Seaver | Rats | 2.89 |
| Don Sutton | Chiefs | 2.92 |
| Luis Tiant | Forest Citys | 2.93 |
| Bob Moose | Tigers | 2.93 |
| Woodie Fryman* | Cougars | 2.93 |
| Tommy John* | Peppers | 2.98 |
| Bert Blyleven | Mountaineers | 3.00 |
| Dick Tidrow | Spiders | 3.01 |
| Clay Kirby | Bombers | 3.06 |
| Skip Lockwood | Mountaineers | 3.06 |
| Bill Parsons | Tigers | 3.11 |
| Claude Osteen* | Peppers | 3.15 |
| Steve Blass | Saxons | 3.15 |
| Bruce Dal Canton | Bombers | 3.16 |
| Pete Broberg | Rats | 3.16 |
| Rudy May* | Chiefs | 3.16 |
| Ken Brett* | Rats | 3.20 |
| Steve Carlton* | Triangles | 3.20 |
| Tom Bradley | Triangles | 3.24 |
| Ernie McAnally | Black Sox | 3.25 |
| Paul Splittorff* | Cougars | 3.28 |
| Pat Dobson | Peppers | 3.28 |
| Dave Roberts* | Mountaineers | 3.29 |
| Jim Barr | Spiders | 3.34 |
| Ken Reynolds* | Replacements | 3.35 |
| Al Downing* | Saxons | 3.36 |
| Mike Cuellar* | Chiefs | 3.37 |
| Juan Marichal | Mountaineers | 3.37 |
| Steve Stone | Eagles | 3.38 |
| Blue Moon Odom | Red Storm | 3.38 |
| Vida Blue* | Thunder | 3.41 |
| Rick Wise | Saxons | 3.46 |
| Ron Bryant* | Tigers | 3.48 |
| Jack Billingham | Dukes | 3.49 |
| Dave McNally* | Triangles | 3.52 |
| Mel Stottlemyre | Forest Citys | 3.52 |
| Fritz Peterson* | Red Storm | 3.54 |
| Gary Gentry | Tourists | 3.56 |
| Steve Arlin | Red Storm | 3.61 |
| Mike Paul* | Volcanoes | 3.64 |
| Dick Drago | Mountaineers | 3.65 |
| Carl Morton | Eagles | 3.65 |
| Ron Reed | Tourists | 3.67 |
| Marty Pattin | Bombers | 3.68 |
| Bill Gogolewski | Bombers | 3.68 |
| Balor Moore* | Peppers | 3.74 |
| Steve Dunning | Black Sox | 3.76 |
| Dick Bosman | Stallions | 3.80 |
| Sam McDowell* | Tourists | 3.90 |
| Ron Schueler | Tourists | 3.93 |
| Mike Caldwell* | Saxons | 3.97 |
| Sonny Siebert | Replacements | 3.97 |
| Fred Norman* | Eagles | 4.01 |
| Wayne Twitchell | Eagles | 4.03 |
| Bruce Kison | Replacements | 4.09 |
| Clyde Wright* | Volcanoes | 4.10 |
| Ken Holtzman* | Forest Citys | 4.17 |
| Jim Palmer | Cubs | 4.18 |
| Milt Wilcox | Cougars | 4.23 |
| Jim Lonborg | Cubs | 4.28 |
| Dave Lemonds* | Stars | 4.35 |
| Stan Bahnsen | Spiders | 4.38 |
| Rich Hand | Spiders | 4.50 |
| Denny McLain | Dukes | 4.60 |
| Dave Hamilton* | Black Sox | 4.64 |
| Jerry Koosman* | Thunder | 4.67 |
| Ross Grimsley* | Forest Citys | 4.68 |
| Bill Champion | Stars | 4.78 |
| Don Stanhouse | Replacements | 4.81 |
| Bill Greif | Eagles | 4.83 |
| Andy Messersmith | Cubs | 4.94 |
| Ray Culp | Replacements | 5.04 |
| Don Gullett* | Dukes | 5.14 |
| Don Carrithers | Dukes | 5.26 |
| Mike Kekich* | Dukes | 5.30 |
| Vince Colbert | Black Sox | 5.71 |
| Jim McGlothlin | Black Sox | 6.15 |
| Steve Renko | Eagles | 6.27 |
| Wayne Simpson | Replacements | 6.29 |
| George Stone* | Dukes | 6.74 |