Mariners Odds 2023 | Best Mariners Spreads, Props, & More

Frank AmmiranteSenior Sports Writer
Last Updated: Mar 7, 2023

The Seattle Mariners will look to build off an impressive 2022 season that saw them advance to the American League Divisional Series before falling short to the eventual champions in the Houston Astros.

Their offense should get a nice boost with the acquisition of Teoscar Hernandez, who hit a combined 57 home runs over the last two seasons. They also brought in veterans A.J. Pollock and Kolten Wong, adding more depth to their lineup.

The rotation projects as one of the best in baseball. Not only will they get a full year from trade deadline pickup Luis Castillo, but they should also see continued development from young studs like Logan Gilbert and George Kirby, not to mention 2021 AL Cy Young Robbie Ray.

The bullpen is absolutely elite, anchored at the back by Paul Sewald and Andrés Muñoz. When you combine the rotation with this group of relievers, it’s easy to see the M’s ranking among the best in run prevention.

The Mariners have a chance to take their game to the next level and become World Series contenders. At worst, we can project them as a playoff team. With that in mind, let’s dive into the Mariners betting odds for the 2023 season.

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Mariners Top Betting Odds 2023

Mariners MLB betting odds are current as of Mar. 7 at 1 p.m. EST from Caesars Sportsbook.

  • World Series Winners: (+1700)
  • Win American League pennant: (+800)
  • Win AL West title: (+320)
  • Win Total: Over 88 (-110) | Under 88 (-110)

The Mariners are 9th in World Series, 4th in the American League pennant, and 2nd in AL West odds. Their season win total is tied for the 11th-highest in MLB.

The best value here is to take them to win the World Series at +1700 odds. With this approach, you have hedging opportunities, where you can bet on the opposing side as they get deeper into the playoffs.

The problem with taking Seattle to win the AL pennant is that if it happens, you’d probably wish you took them to win the World Series instead at more than twice the odds.

Their price to win the AL West is too short at +320, considering that they’ll be dealing with the stacked Astros as well as the improved Angels and Rangers.

Seattle’s season win total looks like another solid bet to target, as the bar is not too high here.

2023 MLB Futures Odds

To see the most up-to-date MLB Futures from our favorite sportsbooks, adjust the module below and select your desired wager.

This widget will update with more bets as the offseason progresses.

Mariners Futures Bets 2023

Below you’ll find the top Mariners futures bets for the 2023 season.

Mariners Over 88 Wins (-110) at Caesars Sportsbook

WAGER: 1 Unit

The Mariners finished with a 90-72 record last season, but if we look under the hood, we see a team with untapped potential.

This is a young ball club that got better as the 2022 season went along, going 61-33 (.649) in their final 94 regular season games. That’s a pace of 105 wins over 162 games.

Now, that’s not to say that they’ll maintain that pace in 2023, but they have the pieces in place to fly past 90 wins.

The offense finished with a 107 wRC+ (T-8th) and .160 ISO (9th) last season. The Mariners already had a lot of power, but adding Hernandez (.224 ISO in 2022) will make this lineup quite formidable.

When you consider the strength of their rotation with Castillo, Gilbert, Kirby, and Ray, along with their elite bullpen led by Sewald and Muñoz, you see a team that excels in three phases of the game.

Seattle’s arrow is trending up right now.

Mariners to win the World Series (+1700) at Caesars Sportsbook

WAGER: 1 Unit

We’re getting good value on the Mariners to win the World Series. They’re going to be a tough opponent in the postseason with their rotation and bullpen.

Steamer projects each of their top three starters to provide heavy volume this season:

  • Castillo: 195 IP
  • Ray: 191 IP
  • Gilbert: 176 IP

Each of these starters has the ability to strike out opposing hitters at a high rate.

When you add in Kirby, who posted a 20.5 K-BB% in his rookie season, you come away feeling impressed with this rotation.

The other piece to this is that they can shorten the game with their dominant relievers. We already mentioned Sewald and Munoz, but there’s also Diego Castillo and Matt Brash.

With a stacked rotation and bullpen filled with shutdown relievers, Seattle has the key elements of a World Series champion.

Mariners Player Prop Bets 2023

Julio Rodriguez to win AL MVP (+800) at Caesars Sportsbook

WAGER: 1 Unit

Rodriguez is a phenom in every sense of the word, slashing .284/.345/.509 with 28 home runs and 25 stolen bases as a rookie in his age-21 season.

He was worth 5.4 WAR as a rookie, which is an encouraging sign for his MVP chances moving forward.

This is a young hitter who got better as the season went along:

  • 1st Half: 136 wRC+, .202 ISO, 6.8 BB%, 26.8 K%
  • 2nd Half: 169 wRC+, .273 ISO, 7.8 BB%, 23.9 K%

There’s a chance that Rodriguez can elevate his game in Year 2, putting him in an excellent position to contend for this award.

Rodriguez has the ability to approach 40 home runs with 20+ steals. At +800 odds, there’s still enough value to bet him to win AL MVP.

Luis Castillo to win AL Cy Young (+1600) at Caesars Sportsbook

WAGER: 1 Unit

Castillo put up a 3.17 ERA and 1.10 WHIP with 17 walks and 77 strikeouts in 65.1 innings after joining the Mariners in a trade deadline deal with the Cincinnati Reds.

The 30-year-old righty is going to enjoy playing a full year in Seattle, as T-Mobile Park is a huge park upgrade compared to the bandbox that is Great American in Cincinnati. Fewer home runs in Seattle means a better ERA for Castillo.

Steamer projects the following for the Mariners’ ace:

195 IP, 3.34 ERA, 1.19 WHIP, 25.4 K%, 7.8 BB%

Here we have the ideal combination of volume (195 IP), ratios (3.34 ERA, 1.19 WHIP), and strikeouts (25.4 K%) that could allow him to contend for AL Cy Young.

Castillo definitely has the arsenal in his bag (12.6 SwStr%) that could allow him to rack up strikeouts within the friendlier confines of T-Mobile Park.

We could see a career year out of the veteran righty in 2023.

How to Bet Mariners Moneylines

Moneyline bets are a simple way of wagering on MLB games. All you need to do is pick the winner of the game, and you’ll win your bet.

The odds are quite easy to understand, too. For example, if the Mariners are a (-200) favorite, you would have to bet $20 to win $10. If they’re a (+200) underdog, you can win $20 off a $10 bet.

These odds will change every day depending upon the Mariners matchup, so there’s always an opportunity for value every step of the way.

How to Bet Mariners Run Line

Run Line betting is another common way to bet on MLB games, and you’re probably already familiar with it. You may know it as how much a team is “picked by" to win.

If the Mariners are 1.5 run favorites over the Angels, the Run Line would look something like this: Mariners -1.5 (+150) vs Angels +1.5 (-150).

In this scenario, the Mariners would have to win by more than one run to cash your bet.

How to Bet Mariners Over/Unders

If you’re unsure about the Mariners moneyline or run line on a given day, you can still place a bet on the Over/Under — or total — in the matchup.

Sportsbooks will set a line for how many combined runs they project will be scored. From there, you can bet on the Over or Under.

For example, if you believe in the Mariners offense and think it’ll be a high-scoring game, then you’ll want to take the Over. However, if it’s supposed to be more of a pitcher’s duel, you should go with the Under.


Frank Ammirante

Frank Ammirante is a Senior Sports Writer at The Game Day. Previously, he wrote for 4for4 Football and RotoBaller. Frank is a member of the Fantasy Sports Writer's Association while maintaining an active presence within the community. He has competed in industry contests like the Scott Fish Bowl, The Great Fantasy Baseball Invitational, and more. Frank will be making his debut in Tout Wars this year. He's got a diverse sporting background, but specializes in football and baseball.

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