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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Lg | LgAvg | LgERA | Champion | Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|---|---|---|---|
| UL | .264 | 4.30 | 2012 | 4.14 | .255 | FL | ||
| UL | .259 | 4.05 | Oakland Roses | 2013 | San Diego Snakeyes | 4.11 | .257 | FL |
| UL | .260 | 4.13 | Seattle Sting | 2014 | Georgia Bulldogs | 4.00 | .251 | FL |
| UL | .255 | 3.95 | Bronx Bombers | 2015 | Tampa Bay Bandits | 3.85 | .249 | FL |
| UL | .272 | 4.25 | Texas Vipers | 2016 | Tampa Bay Bandits | 4.19 | .269 | FL |
| UL | .274 | 4.15 | Oakland Roses | 2017 | Tampa Bay Bandits | 4.15 | .267 | FL |
| UL | .250 | 4.88 | Oakland Roses | 2018 | Phoenix Firebirds | 4.74 | .247 | FL |
| UL | .259 | 4.81 | Oakland Roses | 2019 | Philadelphia Phalanx | 4.70 | .255 | FL |
| UL | .249 | 4.59 | Cincinnati Stars | 2020 | Denver Bears | 4.55 | .246 | FL |
| UL | .252 | 4.14 | Pittsburgh Ironmen | 2021 | Philadelphia Phalanx | 3.94 | .247 | FL |
| UL | .247 | 4.08 | Toronto Hogs | 2022 | Los Angeles Spirit | 3.91 | .244 | FL |
| UL | .258 | 4.42 | Seattle Sting | 2023 | Phoenix Firebirds | 4.07 | .249 | FL |
| UL | .248 | 4.41 | Seattle Sting | 2024 | Tampa Bay Bandits | 4.56 | .249 | FL |
| UL | .258 | 4.41 | 2025 | 4.43 | .252 | FL |
