MLB2026 season
Boston Red Sox vs Seattle Mariners
Head-to-head win probability for MLB. Next meeting when one is scheduled, otherwise the most recent game. This season's results use the last pre-kickoff number.
Most recent meeting
Sun, Jun 21, 2026
This season
2026 meetings. Pre-kickoff win probability and the result.
Model record on this matchup
Graded on the last pre-kickoff win probability, the same rule as the accuracy page. Preseason excluded.
Hit rate
33%
1 of 3 decided games
Meetings graded
3
2026
Correct calls
1
Favorite won
Factor comparison
Each team's top factors from this page's featured meeting.
Boston Red Sox
- ELO Rating — Yankees ELO 1533 vs Red Sox ELO 1567 (diff: -35)
Seattle Mariners
- Home Field Advantage — Mariners are 38-35 at home this season; Angels are 30-48 on the road
- Defensive Efficiency — Mariners pitching/defense (4.5 RA/G) better than Angels (4.6 RA/G)
- ELO Rating — Mariners ELO 1462 vs Angels ELO 1417 (diff: +46)
Get the weekly model report card
Every Monday: last week's hit rate, Brier score, and the model's biggest misses. One email a week.