Seattle Mariners Odds

Seattle Mariners 2025 Season Preview

The Seattle Mariners ended the 2024 season with an 85-77 record. The Mariners boast one of the best starting rotations in baseball, led by All-Star Luis Castillo, breakout star George Kirby, and reliable veteran Logan Gilbert. Outfielder Julio Rodríguez is the centerpiece of the Mariners' lineup. The team was relatively quiet this past offseason as they re-signed Jorge Polcano to a modest 1-year deal and signed Donovan Solano to add some extra power to the lineup.

The Mariners currently boast the third-best odds to win the AL West in what should be one of the most competitive divisions in baseball.

Much will depend on the continued development of their young stars and whether the pitching staff can carry the team when the offense sputters.

See all of the Mariner's odds, as well as their win total, championship odds, and much more.

Betting on the Seattle Mariners

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Mariners Spread (Run Line)

When betting on baseball, you’ll be faced with three standard options: the moneyline, over/under and run line.

The run line is a bet on the margin of victory, like a point spread. But because baseball is low scoring, the spread will almost always be -1.5 for the favorite and +1.5 for the underdog. The payouts for each will just be adjusted based on each team’s strength.

Here’s a brief example of a run line for a hypothetical Mariners game:

• Oakland Athletics (+1.5)
• Seattle Mariners (-1.5)

As shown above, the Mariners are favored by 1.5 runs against the Athletics; the minus sign (-) indicates Seattle is the favorite, while a plus sign (+) is used to denote the underdog. Bettors who wanted to back Seattle here would be “laying” those 1.5 runs, meaning for their bets to cash the Mariners would need to win by two runs or more. Bettors who selected the Athletics +1.5 would win if Oakland won outright or kept a loss to 1 run.

Mariners Moneylines

Many first time bettors are wary of run line bets, especially when riding with the hometown team. In that case, moneyline wagers are often seen as the safer way to go. A moneyline bet is a bet on who wins the game -- no run line involved.

Let’s use the same example from before to understand the moneyline better:

• Oakland Athletics +150
• Seattle Mariners -180

Just as with run lines, the minus sign (-) signifies a team is favored, while the plus sign (+) means a team is the underdog. The moneyline odds, written in American odds format here, indicate how big or small a favorite that team is, written in increments of $100. For example, to win $100 on the Mariners, a bettor would need to risk $180. On the flip side, a $100 bet on the Athletics would net $150 if they pulled the upset.

Odds can differ from sportsbook to sportsbook, so always make sure you shop for the best line with The Action Network app.

Mariners Over/Unders

Betting on a team to win or cover a run line isn’t the only type of wager allowed on MLB games. Almost all sportsbooks will offer a total on the game, also known as an over/under. This bet is not on the winner of the contest, but on the number of runs the two teams will combine to score; sportsbooks hang a number, and bettors can wager either over or under that total.

If the number for our hypothetical Mariners-A’s matchup was 8 runs, over bettors would require 9 points or more to cash their tickets, while those who bet the under would need 7 or fewer runs. If the two teams scored exactly 8 runs between them, that bet would push and all wagers would be refunded.

Mariners Props

Some bettors find more entertainment and success betting on more specific outcomes than the result of the game. Prop bets cover a wide market of wagers on player stats, discrete in-game events, and any style of yes/no question. Many props are bets on specific players and their performance, such as betting Jarred Kelenic over 1.5 hits on a given night, or betting that Robbie Ray will strike out over 9.5 batters. Some props can be shorter term, such as betting on the number of runs scored in the first five innings or who will hit a home run. Offerings tend to vary depending on the sportsbook, so use our sportsbook reviews to find the best bet for you.

Mariners Futures

Expectations are high right now in Seattle, so bettors still have to shop for the best line to get good odds on Mariners futures bets. Futures are bets that focus on long term outcomes, like the Mariners to win the AL West, win the American League Pennant, win the World Series, or even individual awards like winning league MVP.

How to Bet on the Seattle Mariners

Online sports betting is not currently legal in the state of Washington, but it is expected to become available in 2024. Bettors are currently able to bet in-person at a variety of tribal casinos throughout the state. Stay up to date on The Action Network's Washington sports betting page for updates regarding sports betting legislation.

If you’re able to get to a state where online betting is legal, The Action Network has partnerships with several sportsbooks that give you exclusive access to great promotions if you are located within the state.

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