The Baltimore Orioles host the Seattle Mariners on August 13, 2025. First pitch from Oriole Park at Camden Yards is scheduled for 6:35 p.m. ET; the game will be broadcast on ROOT Sports NW.
Find my MLB betting preview and Mariners vs Orioles prediction below, as well as probable pitchers, betting trends, injury reports and more.
My Mariners vs Orioles Prediction
Mariners vs Orioles pick: Under 8.5
My Mariners vs Orioles best bet is on the under. Make sure to find the best odds by checking our live MLB odds page.
Mariners vs Orioles Odds, Spread
| Mariners Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
-1.5 +113 | 8.5 -112o / -109u | -148 |
| Orioles Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
+1.5 -137 | 8.5 -112o / -109u | +122 |
Mariners vs Orioles Projected Starting Pitchers
| RHP Logan Gilbert (SEA) | Stat | LHP Trevor Rogers (BAL) |
|---|---|---|
| 3-4 | W-L | 5-2 |
| 2.1 | fWAR (FanGraphs) | 2.1 |
| 3.35 / 2.68 | ERA / xERA | 1.44 / 3.25 |
| 2.89 / 2.53 | FIP / xFIP | 2.56 / 3.65 |
| 0.98 | WHIP | 0.83 |
| 28.9 | K-BB% | 16.5 |
| 42.4 | GB% | 47.9 |
| 94 | Stuff+ | 90 |
| 114 | Location+ | 104 |
Our Mariners vs Orioles Betting Preview
The Orioles have scored three or fewer runs in seven out of their past eight games.
Yesterday, the first game of this series offered just one run as the Mariners won 1-0, so the under should be in play today with two quality starting pitchers like Logan Gilbert and Trevor Rogers, both of whom have WHIPs under 1.00 this season.
Gilbert has been even better for the Mariners than his stats indicate. He has an xERA of 2.68 and an xFIP of 2.53, so there's still room for improvement this year.
In his last start, he held the White Sox to a run and two hits in five innings, and will now face a recently struggling Baltimore lineup.
Rogers is enjoying a stellar season with the Orioles. His ERA for the season is 1.44, and he has managed to get an even lower ERA at home so far, with 0.42 in the three games he's pitched at Camden Yards.
In his previous outing, Rogers only gave up one run against the Philadelphia Phillies across six innings.
This aligns with our Bet Labs recommendation for the under in this game.
This system targets MLB regular-season games where both teams are coming off low-scoring performances (0 to 2 runs scored in their previous game) within the same series.
These matchups tend to reflect strong pitching or cold offenses, and the market may not adjust the total downward enough in time.
This strategy filters for more recent seasons to reflect current scoring environments and pitcher usage trends.
Betting the under in these situations has shown consistent short-term profitability.
Pick: Under 8.5
Moneyline
There's no value on the moneyline for this affair.
Run Line (Spread)
There's no value on the run line for this matchup.
Over/Under
The play is on the under 8.5.
