The Seattle Mariners host the Boston Red Sox on June 21, 2026. First pitch from T-Mobile Park is scheduled for 4:10 p.m. ET. The game will be broadcast on NESN.
The Mariners are favored by -144 on the moneyline and by -1.5 on the run line. The Red Sox are +122 on the moneyline and +1.5 on the run line. The total is set at 6.5 runs.
Find my MLB picks and Red Sox vs Mariners prediction below, as well as probable pitchers, weather report, and more.
Red Sox vs Mariners Prediction
Red Sox vs Mariners Picks:
- NRFI (-178)
- F5 Under (-120)
Red Sox vs Mariners Odds
| Red Sox Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
+1.5 -200 | 6.5 -122o / -100u | +122 |
| Mariners Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
-1.5 +164 | 6.5 -122o / -100u | -144 |
Red Sox vs Mariners Probable Pitchers
| Payton Tolle (LHP, BOS) | Stat | Logan Gilbert (RHP, SEA) |
|---|---|---|
| 3-4 | W-L | 5-4 |
| 1.7 | fWAR (FanGraphs) | 1.4 |
| 2.93 / 2.66 | ERA / xERA | 3.43 / 4.01 |
| 3.08 / 3.97 | FIP / xFIP | 3.79 / 3.67 |
| 18.6% | K-BB% | 20.8% |
| 34.4% | GB% | 32.9% |
| .268 | BABIP | .259 |
| 115 | Stuff+ | 107 |
| 95 | Location+ | 105 |
Red Sox vs Mariners MLB Betting Preview
The Red Sox and Mariners will duke it out on Sunday afternoon to finish off the last of a three-game set at T-Mobile Park in Seattle.
I’m very excited for this pitching matchup, with Payton Tolle facing off against Logan Gilbert.
In just his second season in the Major Leagues, Tolle has been brilliant, running a 2.93 ERA and 1.06 WHIP through 58 frames.
Like Tolle, Gilbert has also had a great start to the season, running a 3.43 ERA and 1.03 WHIP across 87 innings.
Red Sox vs Mariners Pick, Betting Analysis
Given the elite form of both starting pitchers in Sunday afternoon’s contest, I think this is a great spot to back for there to be no runs scored in the first inning (NRFI) of the game.
As a secondary betting angle, I favor buying into that same starting-pitching duel narrative and thus will be wagering for the first five total to go under in what should be a very closely contested, low-scoring affair.
Picks:
- NRFI (-178)
- F5 Under (-120)
