Boston Red Sox vs Seattle Mariners · All-Time
50 meetings tracked · closing-line graded
RECORD
29-21
MEETINGS
50
ATS
19-13
O / U
21-11
Key Insights
- ▸Boston Red Sox lead 29-21 across 50 tracked meetings.
- ▸Games have averaged 10.3 combined points.
- ▸Boston Red Sox have been the better ATS side (19-13).
- ▸Strong Over trend: 21-11 O/U.
Year-by-Year Record
| Season | Games | Boston Red Sox | Seattle Mariners | ATS | O / U | Avg Total |
|---|---|---|---|---|---|---|
| 2026 | 6 | 3 | 3 | 2-4 | 4-2 | 10.2 |
| 2025 | 6 | 3 | 3 | 3-3 | 3-3 | 7.5 |
| 2024 | 7 | 4 | 3 | 6-1 | 3-4 | 9.4 |
| 2023 | 6 | 3 | 3 | 3-3 | — | 11.0 |
| 2022 | 7 | 6 | 1 | 5-2 | 5-2 | 10.4 |
| 2021 | 4 | 2 | 2 | — | — | 9.8 |
| 2019 | 7 | 4 | 3 | — | — | 14.3 |
| 2018 | 7 | 4 | 3 | — | — | 9.6 |
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Frequently Asked Questions
What is the Boston Red Sox vs Seattle Mariners record all-time?▾
Across 50 all-time meetings, the Boston Red Sox lead the series 29-21.
What is the ATS trend in Boston Red Sox vs Seattle Mariners games?▾
ATS: Boston Red Sox are 19-13 vs the spread in these matchups. Seattle Mariners are 13-19.
Do Boston Red Sox vs Seattle Mariners games go over or under?▾
Over/under: games between Boston Red Sox and Seattle Mariners have gone over 21 times and under 11 times, with an average combined score of 10.3.
When did Boston Red Sox and Seattle Mariners last play?▾
See Last Meetings section for detailed score, spread, and total data from the most recent Boston Red Sox vs Seattle Mariners games.
Where can I see the 5-year Boston Red Sox vs Seattle Mariners history?▾
A 5-year head-to-head page tracks every Boston Red Sox vs Seattle Mariners meeting from the last five full seasons. Link at the bottom of this page.
Data coverage: Trendline's head-to-head records include closing-line-graded games from 2018–2026. Older meetings aren't in this dataset yet.