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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Trent Waswick# | 2.522 | 1952 | |
| 2 | Justin Lawrence# | 2.598 | 1958 | |
| 3 | Dwight Paulsen# | 2.653 | 1956 | |
| 4 | Rich Donnelly# | 2.887 | 1956 | |
| 5 | Callum MacLean# | 2.954 | 1954 | |
| 6 | Roger Stratton# | 3.058 | 1958 | |
| 7 | Raymond Xx# | 3.068 | 1954 | |
| 8 | Logan Smith# | 3.129 | 1957 | |
| 9 | Mike Mark# | 3.172 | 1958 | |
| 10 | Chris Fischer | 3.176 | 1954 | |
| 10 | Jim Wigginton# | 3.176 | 1958 | |
| 12 | Chiaki Nakanishi# | 3.199 | 1958 | |
| 13 | Justin Lawrence# | 3.280 | 1954 | |
| 14 | Doug Price# | 3.282 | 1958 | |
| 15 | Keverne Griffin# | 3.354 | 1953 | |
| 16 | Ricky Camacho# | 3.445 | 1956 | |
| 17 | Takehiko Okuno# | 3.469 | 1954 | |
| 18 | Sean Scherff | 3.478 | 1952 | |
| 19 | Liang Chen# | 3.498 | 1952 | |
| 20 | Pi-ao Shui# | 3.506 | 1952 | |
| 21 | Mitch Kircher# | 3.511 | 1958 | |
| 22 | Ismael Casias# | 3.524 | 1955 | |
| 23 | Larry Lewis# | 3.528 | 1957 | |
| 24 | Zach O'Flaherty# | 3.569 | 1952 | |
| 25 | Helmuth Fries# | 3.586 | 1956 | |
| 26 | Mathieu Simonin# | 3.625 | 1953 | |
| 27 | Jean-Louis Monnier# | 3.685 | 1956 | |
| 28 | Chris Alexander# | 3.695 | 1955 | |
| 29 | Jean-Louis Monnier# | 3.700 | 1955 | |
| 30 | Zach O'Flaherty# | 3.706 | 1957 | |
| 31 | Danny Alarcon | 3.707 | 1953 | |
| 32 | Shanahan Gales# | 3.720 | 1957 | |
| 33 | Dave Walker | 3.724 | 1954 | |
| 34 | Mike Mark# | 3.727 | 1955 | |
| 35 | Kazuto Shimokawa# | 3.786 | 1956 | |
| 36 | Kyle Haas# | 3.818 | 1955 | |
| 37 | Bobby Dowell | 3.832 | 1956 | |
| 38 | Kuisma Hartonen# | 3.847 | 1958 | |
| 39 | Yong-ho Kim | 3.857 | 1954 | |
| 39 | Tiberiu Haraidon# | 3.857 | 1958 | |
| 39 | Logan Smith# | 3.857 | 1958 | |
| 39 | Austin Kotewa# | 3.857 | 1955 | |
| 43 | Justin Lawrence# | 3.877 | 1955 | |
| 44 | Dermott Mistry | 3.884 | 1956 | |
| 45 | Eric Spencer | 3.908 | 1958 | |
| 46 | Jim Meagher# | 3.917 | 1952 | |
| 47 | Tom Ledoux# | 3.967 | 1953 | |
| 48 | Justin Lawrence# | 3.972 | 1956 | |
| 49 | Justin Corey# | 3.986 | 1956 | |
| 50 | Pyry Uusikartano# | 3.993 | 1957 | |
| 51 | Brian Amspacher# | 4.004 | 1956 | |
| 52 | Jonathan Willis# | 4.005 | 1955 | |
| 53 | Mitch Kircher# | 4.024 | 1954 | |
| 54 | Roberto Bianchetti | 4.067 | 1952 | |
| 55 | Tomofumi Sugimoto | 4.144 | 1953 | |
| 56 | Rich Lutz | 4.147 | 1954 | |
| 57 | Justin Frost# | 4.175 | 1958 | |
| 58 | Mike Stark# | 4.191 | 1954 | |
| 58 | Larry Lewis# | 4.191 | 1958 | |
| 60 | Zach O'Flaherty# | 4.217 | 1958 | |
| 61 | Unto Honka# | 4.225 | 1956 | |
| 62 | Jim Sacco | 4.228 | 1954 | |
| 63 | Mitch Kircher# | 4.233 | 1956 | |
| 64 | Sam Rosenberg | 4.234 | 1952 | |
| 65 | Ricky Figueroa# | 4.275 | 1958 | |
| 66 | Bas Petersen# | 4.286 | 1955 | |
| 67 | Patrizio Calazzo# | 4.302 | 1958 | |
| 68 | Jorge Rivera# | 4.303 | 1952 | |
| 69 | Dowd Wilson# | 4.304 | 1955 | |
| 70 | Nick Chasteen# | 4.313 | 1956 | |
| 71 | Edwin Sanchez# | 4.332 | 1956 | |
| 72 | John Morris | 4.412 | 1954 | |
| 73 | Lukyan Treumov# | 4.433 | 1957 | |
| 74 | Ruben Myers# | 4.441 | 1958 | |
| 75 | Alex Torres# | 4.449 | 1954 | |
| 76 | Francis Griffiths# | 4.451 | 1956 | |
| 77 | Joe Rogers# | 4.452 | 1955 | |
| 78 | Chris Fischer | 4.462 | 1953 | |
| 79 | Patrick Smit# | 4.464 | 1955 | |
| 80 | Bill South# | 4.489 | 1952 | |
| 81 | Zach O'Flaherty# | 4.510 | 1953 | |
| 82 | Anders Jensen | 4.513 | 1953 | |
| 82 | John Abdon | 4.513 | 1957 | |
| 84 | Leandro Boccherini | 4.530 | 1957 | |
| 85 | Romel Quico | 4.531 | 1952 | |
| 86 | Dave Walker | 4.551 | 1953 | |
| 87 | Willie Moreno# | 4.553 | 1954 | |
| 88 | Robby Dedrick# | 4.562 | 1954 | |
| 89 | Justin Frost# | 4.565 | 1957 | |
| 90 | Michele Mascolo | 4.581 | 1953 | |
| 91 | Takehiko Okuno# | 4.582 | 1956 | |
| 92 | Baldassario Scuderi# | 4.585 | 1952 | |
| 92 | Jonathan Willis# | 4.585 | 1958 | |
| 94 | Danny Bennett# | 4.618 | 1953 | |
| 95 | Ivan Martinez | 4.622 | 1952 | |
| 96 | Fremont Ruff# | 4.649 | 1957 | |
| 96 | Dwight Paulsen# | 4.649 | 1952 | |
| 98 | Matt McGovern# | 4.652 | 1956 | |
| 99 | Ruben Myers# | 4.673 | 1955 | |
| 100 | Mike Mark# | 4.700 | 1956 |
