Seattle Mariners 2025 MLB Betting Lines
In 2025, the Seattle Mariners have flirted with a potential playoff run, but after a promising start, they are falling further behind the Houston Astros. Houston is the traditional power of the American League West and is resurgent after a disappointing 2024 campaign. The improved Astros have thrown a wrench into the Mariners' hopes. In 2024, it was more of the same for the Seattle Mariners. Seattle teased fans and gamblers with a playoff berth in the mediocre American League West but failed to close the deal, a trend that seems likely to continue in 2025. Few teams are better at perpetually disappointing their fans than the Seattle Mariners. Seattle is a tough sell to the casual sector due to its mediocre history. A lackluster offseason has not inspired confidence or much betting action.
MLB Betting Lines
Seattle Mariners MLB Betting Lines
The Seattle Mariners are +3000 to win the 2025 World Series, +1300 to win the American League Pennant, and are +550 to win the American League West. Seattle ranks 13th for MLB payroll.
Sail Into Profit!
Drop anchor on solid bets? Bet Seattle Mariners 2025 MLB Odds at BookMaker—money lines, run lines, totals, player props, and World Series futures all season long.
* Trusted by sharp bettors for over 30 years
* Early odds, fast payouts, and Bitcoin betting
* Live betting and mobile-optimized sportsbook
* Don’t just watch the action — bet on it!
* Sign Up Now and lock in your Mariners picks today!
Halfway Report
The Seattle Mariners are 43-40 and 46-33-4 over the total. The Mariners are 6.5 games behind the Houston Astros as the second place team in the American League West. Seattle is 20-19 at home and 23-21 on the road. Seattle is -35 units with the moneyline and is -907 on the run line. Seattle is -281 units at home and +246 on the road.
Seattle ranks 12th for run production, 10th for OPS, 7th for home runs, and 4th for stolen bases. On the mound, Seattle is 17th for earned run average, 17th for WHIP, 13th for quality starts, and 10th for bullpen earned run average. Seattle is a good fielding team, ranking 4th for fewest errors committed.
Key Players
RHP Luis Castillo is the #1 starter for Seattle. Last year, Castillo was 11-12 with a 3.64 earned run average with a 1.17 WHIP. In 2023, he was 14-9 with a 3.34 ERA and 1.10 WHIP. Castillo is a three-time All-Star. So far in 2025, Castillo is 4-5 with a 3.55 earned run average and a 1.29 WHIP.
RHP Andres Munoz is the Seattle closer. In 2023, Munoz was 4-7 with a 2.94 ERA and 1.27 WHIP with 13 saves in 16 opportunities. In 2024, he posted a 3-7 record with a 2.12 ERA and a 0.96 WHIP. Munoz saved 22 games. So far in 2025, Munoz is 3-1 with a 1.16 earned run average and 0.90 WHIP. He has 18 saves in 23 chances.
In 2023, CF Julio Rodriguez produced 102 runs, 37 doubles, 32 home runs, 103 runs batted in, a .485 slugging percentage, and a .818 OPS. He is a two-time All-Star and two-time Silver Slugger Award winner. Last year, he hit .273 with 20 home runs and 68 RBI. He hit .273 with a .734 OPS. Thus far in 2025, Rodriguez has 51 runs, 12 doubles, 11 home runs, 42 runs batted in, a .259 batting average, and a .726 OPS.
Catcher Cal Raleigh is a 2025 AL MVP candidate with 59 runs, 16 doubles, 32 home runs, 69 runs batted in, a .275 average, and a 1.031 OPS.
Manager
Manager Dan Wilson took over at the end of last season and went 21-13. He is a former Mariners player and is a member of the team’s Hall of Fame.
Season-by-Season Record (Since 2015)
| SEASON |
WINS |
LOSSES |
FINISH |
POSTSEASON |
| 2024 |
85 |
77 |
2nd |
- |
| 2023 |
88 |
74 |
3rd |
- |
| 2022 |
90 |
72 |
2nd |
Lost ALDS (Astros) 3–0 |
| 2021 |
90 |
72 |
2nd |
- |
| 2020 |
27 |
33 |
3rd |
- |
| 2019 |
68 |
94 |
5th |
- |
| 2018 |
89 |
73 |
3rd |
- |
| 2017 |
78 |
84 |
3rd |
- |
| 2016 |
86 |
76 |
2nd |
- |
| 2015 |
76 |
76 |
4th |
- |
MLB Teams
American League - West
American League - Central
American League - East
National League - West
National League - Central
National League - East
Did You Know?
At BookMaker, we go beyond just providing top-notch sports betting options! Take advantage of these exclusive features and rewards:
BookMaker ATM Card for seamless transactions: Easily access your funds with the BookMaker ATM card, providing instant access to your winnings and secure transactions wherever you go.
Loyalty Levels & BetPoints Programs for additional rewards: Earn BetPoints as you bet, and unlock exciting perks at higher loyalty levels. The more you play, the more you earn!
Seasonal and Reload Bonuses to maximize your earnings: Stay ahead with seasonal promotions and reload bonuses, boosting your bankroll throughout the year.
Early Cashout Option for added flexibility: Cash out your bet early and lock in profits or limit losses—putting you in control of your wagers.
Free Crypto Payouts for fast and secure withdrawals: Enjoy fast, secure withdrawals with zero fees when you choose crypto payouts.
Open Play Option for unique parlay betting: Get creative with your parlays using the Open Play option, offering more ways to win.
Casino Promotions & Contests for extra fun and wins: Join in on exclusive casino promotions and contests, adding excitement to your betting experience.
8% Cash Back on all your horse racing bets: Place horse racing bets and get 8% cash back on your losses, making it easier to bounce back.
Explore all these benefits and more at BookMaker!
Betting Rules & Policies
Free Play Rules
- Free plays cannot be used on proposition bets.
- Free Plays do not earn any BetPoints™
- Bets made using Free Plays do not count towards completing any rollovers. (Free Plays are always subject to a rollover of their own. You must complete the required rollover prior to making a withdrawal).
- The maximum payout for any Free Play is $5,000.
- Free Plays that are left unused for 180 days will be removed from your account.
ROLLOVER
- Did you know that on all deposits made at BookMaker, there is a rollover requirement: an amount of betting action you must fulfill before you are eligible to make a withdrawal.
- Did you know that rollovers are calculated by multiplying the amount initially credited to your account a certain number of times? Yes! If you deposit without claiming any bonus, the rollover will always be 1x (one-time) your deposit amount. If you do claim a deposit bonus, the rollover will be higher and is based on the deposit plus bonus amount.
Wager disputes (claims)
If you disagree with any aspect of a wager you’ve placed, you are welcome to log an official dispute (commonly known as a “claim”). Claims must be reported no later than 15 (fifteen) calendar days following the settlement of the wager.
If following an initial review of the case there remains any doubt regarding the wager type, line, market, amount, or any other detail, the claim will be escalated to the BookMaker management team. All decisions made by them are final.
Wager Cash Out - How it works
With the Cash Out feature you can choose to eliminate a wager that's already been placed, and receive back either a portion, or your full stake amount.
Cash Out is selectively available on certain events, fixtures, and markets.
In order to see if a wager is eligible to be cashed out, simply navigate to your Bet Slip and check the 'My Open Bets' tab. If eligible, the Cash Out button will be displayed.
It’s also important to note that Cash Out is not contributing to any bonus or promotion including Bet Point accumulation and Rollover for releasing bonus cash.
