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Hey Rob,
Thanks for subscribing and for the feedback!
I’m comfortable with the metrics I used. Particularly xwOBA, which removes defense from the equation and focuses on what the pitcher (and hitter) have some level of control over…strikeouts, walks, and quality of contact. ERA and similar stats can be influenced by poor defense and/or the judgment of an official scorer. Not xwOBA.
As for the inherited runners scored stat, it too can be influenced by defenders. Also, it’s available at Baseball Reference. Here’s a link to the page.
It turns out Mariner relievers have allowed 19 inherited runners to score, which is the eighth-lowest total entering today. From a ratio perspective, they’ve allowed 19 of 63 inherited runners to score (30%). Ten clubs have a lower percentage, league-average is 33%.
As for late-inning issues, the Mariners’ bullpen has surrendered 46 runs in innings 7-9, which is lowest in MLB. Granted, the team’s number of reliever innings is relatively low, which affects the runs total. But in innings 7-9, M’s relievers have held opponents to the third-lowest AVG (.212), plus the lowest OBP (.277), wOBA (.267), and xwOBA (.271) and the second-lowest SLG (.319).
All the best!
Luke