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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Michael Morales# | 0.564 | 2024 | |
| 2 | Jerming Rosario# | 0.945 | 2024 | |
| 3 | Gage Hinsz | 1.007 | 2024 | |
| 4 | Nick Travieso | 1.096 | 2024 | |
| 5 | Yordanny Monegro# | 1.145 | 2024 | |
| 6 | Miguel Ullola# | 1.174 | 2024 | |
| 7 | Calvin Ziegler# | 1.206 | 2024 | |
| 8 | Brady Smith# | 1.937 | 2024 | |
| 9 | Jackson Cox# | 2.091 | 2024 | |
| 10 | Adrian Morejon# | 2.329 | 2022 | |
| 11 | Luis Gutierrez# | 2.366 | 2024 | |
| 12 | Yefri Del Rosario | 2.514 | 2021 | |
| 13 | Juan Then# | 2.571 | 2022 | |
| 14 | David Paulino | 2.914 | 2023 | |
| 15 | Victor Lizarraga# | 3.050 | 2023 | |
| 16 | AJ Smith-Shawver# | 3.137 | 2023 | |
| 17 | Carlos Vargas# | 3.261 | 2021 | |
| 18 | Calvin Ziegler# | 3.375 | 2023 | |
| 19 | Jake Wong# | 3.456 | 2023 | |
| 20 | Juan Then# | 3.614 | 2021 | |
| 21 | Ryan Webb# | 3.796 | 2023 | |
| 22 | Michael Morales# | 4.081 | 2023 | |
| 23 | Irv Carter# | 4.200 | 2023 | |
| 24 | Brock Selvidge# | 4.943 | 2023 | |
| 25 | Mike Burrows# | 5.028 | 2021 |
