League Records - Earned Run Average
| RK | SEASON | TEAM (SEASON RANK) | R | HR | RBI | SB | AVG | W | SV | K | ERA | WHIP | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | 1992 | Denver Bisons (1st) | 867 | 122 | 657 | 192 | 0.2697 | 87 | 62 | 828 | 3.049 | 1.248 | 80.0 |
| 2. | 1990 | Banana Slugs Beach Club (4th) | -- | 128 | 646 | 103 | 0.2569 | 82 | 46 | -- | 3.108 | 1.244 | 49.5 |
| 3. | 1992 | Banana Slugs Beach Club (4th) | 709 | 151 | 678 | 134 | 0.2644 | 84 | 25 | 900 | 3.147 | 1.189 | 68.0 |
| 4. | 1992 | Salt Lake City Thrash (7th) | 594 | 72 | 546 | 157 | 0.2667 | 65 | 22 | 701 | 3.159 | 1.175 | 49.0 |
| 5. | 2021 | Carolina Thunderdogs (1st) | 986 | 280 | 900 | 100 | 0.2530 | 75 | 20 | 1297 | 3.160 | 1.100 | 90.5 |
| 6. | 1991 | Salt Lake City Thrash (1st) | -- | 145 | 621 | 172 | 0.2690 | 81 | 37 | -- | 3.163 | 1.193 | 62.0 |
| 7. | 2014 | Crowleys Ridge Roosters (2nd) | 779 | 166 | 674 | 94 | 0.2690 | 97 | 63 | 1443 | 3.180 | 1.180 | 83.0 |
| 8. | 2015 | Carolina Thunderdogs (1st) | 839 | 176 | 753 | 147 | 0.2690 | 90 | 60 | 1303 | 3.180 | 1.170 | 87.5 |
| 9. | 2013 | Pasadena Marauding Gods (4th) | 704 | 161 | 705 | 68 | 0.2570 | 72 | 105 | 1044 | 3.200 | 1.180 | 62.0 |
| 10. | 2015 | Down East Wood Ducks (3rd) | 739 | 167 | 671 | 117 | 0.2560 | 85 | 62 | 1451 | 3.210 | 1.150 | 69.0 |
| 11. | 2013 | Carolina Thunderdogs (1st) | 852 | 184 | 866 | 111 | 0.2770 | 74 | 54 | 1176 | 3.230 | 1.210 | 88.0 |
| 12. | 1991 | HugoMarina Swans (7th) | -- | 128 | 620 | 140 | 0.2558 | 66 | 48 | -- | 3.277 | 1.264 | 40.0 |
| 13. | 2012 | Crowleys Ridge Roosters (5th) | 733 | 183 | 676 | 137 | 0.2599 | 115 | 38 | 1229 | 3.281 | 1.166 | 66.0 |
| 14. | 2018 | Virginia Hat Lineup (3rd) | 829 | 207 | 717 | 105 | 0.2500 | 68 | 70 | 1197 | 3.290 | 1.140 | 68.5 |
| 15. | 2014 | Washington Beltways (1st) | 928 | 182 | 800 | 201 | 0.2660 | 83 | 67 | 1206 | 3.310 | 1.140 | 98.0 |
| 16. | 2008 | Canandaigua Aces (1st) | 951 | 226 | 965 | 147 | 0.2745 | 79 | 54 | 1220 | 3.314 | 1.226 | 103.5 |
| 17. | 1992 | Pasadena Marauding Gods (5th) | 654 | 91 | 553 | 139 | 0.2514 | 77 | 57 | 959 | 3.315 | 1.239 | 56.5 |
| 18. | 2005 | Washington Beltways (6th) | 827 | 165 | 702 | 129 | 0.2629 | 83 | 42 | 1078 | 3.317 | 1.246 | 74.5 |
| 19. | 2018 | Crowleys Ridge Roosters (1st) | 931 | 235 | 836 | 153 | 0.2690 | 90 | 46 | 1270 | 3.320 | 1.160 | 94.5 |
| 20. | 2022 | Carolina Thunderdogs (1st) | 1016 | 248 | 968 | 125 | 0.2690 | 72 | 43 | 1164 | 3.320 | 1.120 | 92.5 |
| 21. | 2012 | Pasadena Marauding Gods (3rd) | 853 | 204 | 831 | 137 | 0.2682 | 72 | 84 | 1132 | 3.348 | 1.172 | 75.5 |
| 22. | 2022 | Dabigu (2nd) | 850 | 215 | 837 | 93 | 0.2430 | 98 | 66 | 1234 | 3.360 | 1.140 | 83.5 |
| 23. | 2001 | Cambridge Crunch (3rd) | 839 | 178 | 722 | 110 | 0.2627 | 81 | 60 | 1261 | 3.371 | 1.185 | 87.0 |
| 24. | 1992 | Fighting Zebras (10th) | 522 | 99 | 534 | 86 | 0.2596 | 64 | 27 | 649 | 3.376 | 1.312 | 28.5 |
| 25. | 2010 | Carolina Thunderdogs (3rd) | 830 | 173 | 775 | 120 | 0.2544 | 86 | 68 | 1163 | 3.380 | 1.225 | 85.0 |