The Cleveland Guardians host the Seattle Mariners on August 31, 2025. First pitch from Progressive Field is scheduled for 1:40 p.m. EDT; the game will be broadcast on ROOT Sports NW.
The Guardians are on a roll with a four-game winning streak. They defeated the Mariners 5-4 and 4-3 in the first two games of this series and will try to sweep them today.
Find my MLB betting preview and Mariners vs Guardians prediction below, as well as probable pitchers, betting trends, injury reports and more.
My Mariners vs Guardians Prediction
- Mariners vs Guardians pick: Under 8.5 (-120)
My Mariners vs Guardians best bet is Under 8.5 total runs in this game. Make sure to find the best odds by checking our live MLB odds page.
Mariners vs Guardians Odds, Prediction
| Mariners Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
-1.5 +150 | 8.5 100o / -120u | -110 |
| Guardians Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
+1.5 -180 | 8.5 100o / -120u | -110 |
Mariners vs Guardians Projected Starting Pitchers
| RHP Bryce Miller (SEA) | Stat | RHP Tanner Bibee (CLE) |
|---|---|---|
| 3-5 | W-L | 9-10 |
| 0.0 | fWAR (FanGraphs) | 1.1 |
| 5.98 / 5.61 | ERA / xERA | 4.73 / 3.83 |
| 5.22 / 4.91 | FIP / xFIP | 4.64 / 4.30 |
| 1.50 | WHIP | 1.31 |
| 8.1 | K-BB% | 13.4 |
| 36.5 | GB% | 44.0 |
| 103 | Stuff+ | 103 |
| 95 | Location+ | 98 |
Mariners vs Guardians Preview
The first two games of this series produced fewer than 10 runs.
The Guardians offense has been near the bottom in wRC+ throughout this season. They currently rank 28th with an 84 rating, and are dead last in OBP (.295) and average (.224), and next-to-last in slugging (.367).
The Mariners lineup is much more competent, ranking 7th overall in 2025, but has dipped recently and is sitting 13th in wRC+ in August.
They will have to face Cleveland's Tanner Bibee, who already had success against them on June 14, pitching five complete innings and giving up just two runs and four hits.
Our Bet Labs recommendation is to go with the under.
This system targets unders in MLB series games (Game 2 or later) where both teams have winning records, suggesting quality pitching and competitive matchups.
However, public betting leans toward the over ā likely expecting fireworks between top teams ā which creates contrarian value on the under.
By capitalizing on low public support for the under (ā¤35%), the strategy fades public perception in favor of market inefficiencies, especially when bettors overestimate offensive output late in a series.
Pick: Under 8.5 (-120, Fanatics)
Mariners vs Guardians Betting Trends
