STAT-ERA-SEP -- All players in database
Regular season
| Primary |
| Name | Name | ERA |
| Vida Blue* | Thunder | 2.21 |
| Bert Blyleven | Mountaineers | 2.24 |
| Jerry Koosman* | Thunder | 2.25 |
| Ron Reed | Tourists | 2.30 |
| Randy Jones* | Tigers | 2.34 |
| Tom Seaver | Rats | 2.38 |
| Ken Wright | Tourists | 2.41 |
| Carl Morton | Eagles | 2.52 |
| Dave McNally* | Chiefs | 2.56 |
| Steve Renko | Eagles | 2.60 |
| Alan Foster | Stallions | 2.63 |
| Sonny Siebert | Replacements | 2.64 |
| Wilbur Wood* | Thunder | 2.65 |
| Ron Schueler | Tourists | 2.67 |
| Nelson Briles | Volcanoes | 2.71 |
| Phil Niekro | Saxons | 2.72 |
| Jim Colborn | Black Sox | 2.73 |
| Mel Stottlemyre | Forest Citys | 2.73 |
| Andy Messersmith | Cubs | 2.75 |
| Don Sutton | Chiefs | 2.76 |
| Paul Splittorff* | Phillies | 2.77 |
| Rick Reuschel | Bombers | 2.83 |
| Dick Ruthven | Tourists | 2.83 |
| Burt Hooton | Mountaineers | 2.86 |
| Roric Harrison | Red Storm | 2.90 |
| Jim Palmer | Cubs | 2.93 |
| Ken Brett* | Rats | 2.95 |
| Tommy John* | Peppers | 3.00 |
| Doyle Alexander | Red Storm | 3.04 |
| Bill Hands | Tigers | 3.04 |
| Juan Marichal | Mountaineers | 3.05 |
| Claude Osteen* | Peppers | 3.06 |
| Fred Norman* | Eagles | 3.08 |
| Jon Matlack* | Stallions | 3.09 |
| Roger Moret* | Black Sox | 3.12 |
| Steve Rogers | Dukes | 3.14 |
| Dave Roberts* | Mountaineers | 3.21 |
| Joe Decker | Stallions | 3.24 |
| Gaylord Perry | Rats | 3.26 |
| Terry Forster* | Volcanoes | 3.29 |
| Stan Bahnsen | Spiders | 3.31 |
| Jim Rooker* | Volcanoes | 3.34 |
| Dock Ellis | Stars | 3.35 |
| Dick Tidrow | Spiders | 3.37 |
| Jim Barr | Spiders | 3.37 |
| Wayne Twitchell | Chiefs | 3.38 |
| Luis Tiant | Forest Citys | 3.38 |
| Ken Forsch | Stars | 3.40 |
| Ferguson Jenkins | Tourists | 3.41 |
| John Curtis* | Phillies | 3.41 |
| Steve Stone | Replacements | 3.46 |
| Ron Bryant* | Tigers | 3.49 |
| Bill Bonham | Eagles | 3.51 |
| Catfish Hunter | Thunder | 3.52 |
| Joe Coleman | Forest Citys | 3.53 |
| Jim Slaton | Stars | 3.54 |
| Doc Medich | Chiefs | 3.55 |
| Bill Greif | Rats | 3.55 |
| Jerry Bell | Cubs | 3.58 |
| Nolan Ryan | Phillies | 3.62 |
| George Stone* | Dukes | 3.63 |
| Mickey Lolich* | Spiders | 3.66 |
| Mike Cuellar* | Chiefs | 3.68 |
| Bob Gibson | Stars | 3.69 |
| Jim Bibby | Stallions | 3.69 |
| Steve Busby | Tigers | 3.71 |
| Eddie Bane* | Replacements | 3.76 |
| Reggie Cleveland | Tigers | 3.78 |
| Jim Merritt* | Black Sox | 3.90 |
| Jack Billingham | Dukes | 3.91 |
| Bill Singer | Stars | 3.93 |
| Sam McDowell* | Tourists | 3.95 |
| Rick Wise | Saxons | 4.01 |
| Jerry Reuss* | Red Storm | 4.02 |
| Don Gullett* | Dukes | 4.04 |
| Balor Moore* | Peppers | 4.04 |
| Bill Lee* | Phillies | 4.07 |
| Blue Moon Odom | Replacements | 4.17 |
| Dick Woodson | Replacements | 4.20 |
| Pat Dobson | Peppers | 4.28 |
| Pete Broberg | Replacements | 4.28 |
| Rudy May* | Triangles | 4.30 |
| Dick Bosman | Stallions | 4.32 |
| Ken Holtzman* | Forest Citys | 4.33 |
| Steve Arlin | Black Sox | 4.34 |
| Al Downing* | Saxons | 4.35 |
| Milt Wilcox | Phillies | 4.40 |
| Dick Drago | Triangles | 4.58 |
| Steve Carlton* | Triangles | 4.59 |
| Milt Pappas | Eagles | 4.62 |
| Marty Pattin | Bombers | 4.67 |
| Clyde Wright* | Bombers | 4.69 |
| Ernie McAnally | Black Sox | 4.75 |
| Tom Bradley | Triangles | 4.85 |
| Eddie Fisher | Triangles | 4.89 |
| Fritz Peterson* | Red Storm | 4.97 |
| Mike Caldwell* | Saxons | 5.00 |
| Bob Moose | Tigers | 5.03 |
| Don Carrithers | Dukes | 5.04 |
| Jim Perry | Cubs | 5.18 |
| Clay Kirby | Bombers | 5.27 |
| Jim Kaat* | Cubs | 5.43 |
| Jim Lonborg | Volcanoes | 5.51 |
| Mike Torrez | Volcanoes | 5.68 |
| Bill Stoneman | Red Storm | 5.80 |
| Brent Strom* | Peppers | 6.15 |
| David Clyde* | Bombers | 6.39 |