Seattle Mariners vs Kansas City Royals Odds

The Mariners will play the Royals on Thursday, September 18th, 2025. Your timezone's first pitch time is 2:10 pm EDT. Check local listings or your nearest streaming app for coverage.

Learn more about MLB Betting with our handy tutorial and guide. We explain money line, total and run line bets. Plus, a great discussion about exotic bets like MLB Baseball parlays and props.

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Best Mariners at Royals Odds

**Best Moneyline Betting Odds**
Underdog Kansas City Royals	Favorite Seattle Mariners
+105 BetMGM Bet	-125 BetMGM Bet

The Seattle Mariners are the -125 moneyline favorite. Risk $125 to win $100 on the Seattle Mariners at BetMGM. The Kansas City Royals are the +105 underdog at BetMGM. Risk $100 to win $105 on the Kansas City Royals. Learn more about how to bet on money lines.

**Best Total Betting Odds**
Over	Under
9 o -118 BetMGM Bet	9 u -102 BetMGM Bet

BetMGM has the best over line of 9 runs. Risk $118 to win $100. BetMGM has the best under line of 9 runs. Risk $102 to win $100. Our tutorial explains more about total bets.

**Best Run Line Betting Odds**
Underdog Kansas City Royals	Favorite Seattle Mariners
+1.5 -150 BetMGM Bet	-1.5 +125 BetMGM Bet

The Seattle Mariners have a -1.5 +125 run line at BetMGM OH. They are the run line favorite in this matchup. The Kansas City Royals have a +1.5 -150 run line at BetMGM OH. The Kansas City Royals are the run line underdogs. Review how to bet on a point spread with our text and video tutorials.

Matchup Odds FAQs

What is the moneyline for the Seattle Mariners vs Kansas City Royals MLB game on Thursday, September 18th, 2025?

The Seattle Mariners are the -125 moneyline favorite at BetMGM and the Kansas City Royals are the +105 moneyline underdog at BetMGM.

What is the over-under total line for the Seattle Mariners vs Kansas City Royals MLB game on Thursday, September 18th, 2025?

The best over line is 9 -118 runs at BetMGM, which means you risk $118 to win $100 betting the over. The best under line is 9 -102 runs at BetMGM, and that means you risk $102 to win $100 betting the under.

What is the run line for the Seattle Mariners vs Kansas City Royals MLB game on Thursday, September 18th, 2025?

The Seattle Mariners are -1.5 +125 run line favorites at BetMGM, while the Kansas City Royals are +1.5 -150 run line underdogs at BetMGM.

MLB Odds Example

MLB Odds and Outcomes Explained
Game	BetMGM Bet
Mariners Royals 9/18/25 2:10pm EDT	-125 +105

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Possible Moneyline Outcomes

Kansas City Royals bettors risk $100 to win $105 at +105 odds. The implied probability for Kansas City Royals is 48.78%.
Seattle Mariners bettors risk $100 to win $80 at -125 odds. The implied probability for Seattle Mariners is 55.56%.

Seattle Mariners at Kansas City Royals Prop Bets

MLB Prop Bets
+ Displays more odds
	BetMGM Bet
Mariners Royals First Team to Score 9/18/25 2:10pm EDT	-180 +140 Bet
Mariners Royals Tie 1st Inning Winner 9/18/25 2:10pm EDT	+250 +290 -118 Bet
Mariners Royals Tie First 3 Innings Winner 9/18/25 2:10pm EDT	+125 +145 +333 Bet
Mariners Royals To Extra Innings 9/18/25 2:10pm EDT	Yes +825 No -1400 Bet
	BetMGM
Mariners Royals 1st Team to Score Will Win 9/18/25 2:10pm EDT	Yes -250 No +190 Bet
Royals Total Runs SEA at KAN 9/18/25 2:10pm EDT	4.5 o +105 4.5 u -140 Bet
Mariners Total Runs SEA at KAN 9/18/25 2:10pm EDT	4.5 o -125 4.5 u -105 Bet
Luis Castillo Strikeouts Thrown SEA at KAN 9/18/25 2:10pm EDT	3.5 o -175 3.5 u +130 Bet
	BetMGM
Stephen Kolek Strikeouts Thrown SEA at KAN 9/18/25 2:10pm EDT	3.5 o -115 3.5 u -115 Bet

Seattle Mariners & Kansas City Royals Futures Odds

Latest World Series odds, if available, for each team. Review odds for other teams and learn how to bet on the tournament. See past Championship results and learn how to bet World Series teasers, props and parlays.

Seattle Mariners World Series Odds

No World Series TM Seattle Mariners YR: futures available

Kansas City Royals World Series Odds

No World Series TM Kansas City Royals YR: futures available

Seattle Mariners & Kansas City Royals Team Pages

Review each team's season win total odds, futures odds, betting bonuses and other valuable information on our exclusive team betting odds pages. Team betting odds and stats update throughout the season:

Team Standings

2025 MLB Regular Season Standings - Seattle Mariners, Kansas City Royals
Team	W	L	Pct	GB	Home	Away	RS	RA	Diff	Strk	L10
x - Seattle Mariners	90	72	0.556	+7.0	51-30	39-42	766	694	+72	L3	7-3
e - Kansas City Royals	82	80	0.506	+15.0	43-38	39-42	651	637	+14	W2	6-4

How to Bet on the Game

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How to Bet on the Seattle Mariners vs Kansas City Royals MLB Game

Open a new sports betting account before game time.
Review our list of sports betting sites. Open a new account before the game starts on Thursday, September 18th, 2025 at 2:10 pm EDT, making sure to enter all your personal details correctly. Don't forget to add your bonus code.
Visit the sportsbook’s cashier, banking, or deposit page.
Navigate to the sportsbook's deposit page. Use your Visa card or MasterCard, or deposit with a bank transfer, or other methods like Paypal.
Tap to the sportsbook's MLB page, look for the Seattle Mariners vs Kansas City Royals Game.
Navigate to the sportsbook's MLB page. Next, look for live or upcoming matchups. Select the Seattle Mariners vs Kansas City Royals Game.
Choose your bet and place a wager.
Choose your bet and then use the funds you deposited to place a wager. The sportsbook will pay your winnings or deduct a losing wager from your account balance after the game.

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