Xfip
2 articles
Diamond Digest
SIERA vs. xFIP vs. ERA: Why Batted Ball Data Makes SIERA the Sharpest Skill Test for Pitchers
Traditional ERA is a noisy, results-based statistic influenced by factors outside a pitcher's control. Advanced metrics like xFIP and SIERA offer better insights into a pitcher's true skill, with SIERA being the sharpest test due to its consideration of batted ball quality.
Marco Moretti·October 29, 2026
Diamond Digest
Why FIP and xFIP Beat ERA for Predicting a Pitcher's Future
ERA measures past pitching results, but FIP and xFIP offer better insights into a pitcher's true talent and future performance by removing defensive and luck influences. Understanding the differences between these metrics is crucial for making informed fantasy baseball decisions.
Marco Moretti·October 27, 2026