The Boston Red Sox host the Seattle Mariners on September 2, 2026. First pitch from Fenway Park is scheduled for 4:10 p.m. EDT. The game will be broadcast on NESN.
The Red Sox are favored by -136 on the moneyline and by -1.5 on the run line. The Mariners are +115 on the moneyline and +1.5 on the run line. The total is set at 8.5 runs.
Find our MLB picks and Mariners vs Red Sox prediction below, as well as probable pitchers, weather report, and more.
Mariners vs Red Sox Prediction
- Mariners vs Red Sox Pick: Under 8.5 (-114, FanDuel)
Our Mariners vs Red Sox best bet is the full game Under. Make sure to find the best odds by checking our live MLB odds page.
Mariners vs Red Sox Odds
| Mariners Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
+1.5 -182 | 8.5 -106o / -114u | +116 |
| Red Sox Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
-1.5 +150 | 8.5 -106o / -114u | -134 |
- Mariners vs Red Sox moneyline: Mariners +115, Red Sox -136
- Mariners vs Red Sox over/under: 8.5 (-107o / -113u)
- Mariners vs Red Sox spread: Red Sox -1.5 (+152 ), Mariners +1.5 (-183)
Mariners vs Red Sox Probable Pitchers
| Bryce Miller (RHP) | Stat | Patrick Sandoval (LHP) |
|---|---|---|
| 4-8 | W-L | 1-3 |
| 0.8 | fWAR (FanGraphs) | 0.7 |
| 4.12/3.19 | ERA / xERA | 4.20/5.11 |
| 4.32/3.87 | FIP / xFIP | 4.23/4.33 |
| 17.8 | K-BB% | 12.6 |
| 37.5 | GB% | 36.6 |
| .249 | BABIP | .377 |
| 107 | Stuff+ | 102 |
| 110 | Location+ | 99 |
Mariners vs Red Sox MLB Betting Preview
This game sets up as a clean fit for the "Unders with Soft Starters and Neutral Winds" built around soft home starters in the back half of a series.
By game three, both lineups have already seen the other side's pitching mix once, scouting reports are sharper, and the element of surprise that can inflate scoring early in a series is gone.
Patrick Sandoval fits the "soft arm" profile the system targets. His 20.3% strikeout rate is well below league average, and while his surface numbers (4.20 ERA, 1.71 WHIP) look unremarkable, his underlying Statcast profile tells a better story. An 86.3 mph average exit velocity against, a modest 30.1% hard-hit rate, and just a 4.3% barrel rate.
He's not missing many bats, but he's also not the kind of pitcher who gets hit hard consistently, exactly the "moderate WHIP, limited swing-and-miss" combination the system is looking for.
Conditions add to the case. There's no strong directional wind in the forecast at Fenway tonight, removing the kind of exaggerated carry that can turn a quiet game into a track meet, and cooler early-September temperatures in Boston tend to keep the ball from jumping the way it can in peak summer heat.
Pick: Under 8.5 (-114, FanDuel)
