Royals vs Mariners Prediction and MLB Tips - 19 September 2025
Last updated: Sep 18, 2025, 6:11PM | Published: Sep 17, 2025, 9:30PM
The Kansas City Royals will sqaure off with the Seattle Mariners in MLB action at Kauffman Stadium on Friday, starting at 4:10am AEST.
Stephen Kolek (5-5, 3.72 ERA) will start on the mound for the Royals, pitting him against Luis Castillo (9-8, 3.76 ERA) for the Mariners.
This article features Stats Insider's prediction and tips for the Royals vs Mariners game, plus the latest betting odds in Australia.
Who Will Win?
Utilising advanced computer power and data, Stats Insider has simulated the outcome of Friday's Kansas City vs Seattle MLB game 10,000 times.
Our leading predictive analytics model gives the Mariners a 53% chance of defeating the Royals at Kauffman Stadium.
Royals vs Mariners: Odds
The latest betting odds in Australia for Friday's MLB game at Kauffman Stadium are shown below:
- Head to Head: Royals $2.00, Mariners $1.83
- Line: Royals +1.5 ($1.65), Mariners -1.5 ($2.29)
- Total (Over/Under 9 Runs): Over $1.91, Under $1.91
Odds are correct at the time of publication and subject to change.
Looking at the latest head-to-head odds, the bookmakers currently have the Royals at $2.00 and the Mariners at $1.83.
The Royals are listed as 1.5-run underdogs against the Mariners, with odds of $1.65 available at TAB.
For the favourite Mariners (-1.5) to cover the line, TAB offers odds of $2.29.
The over/under for total runs scored is set at 9 with TAB, which has odds of $1.91 for the over and $1.91 for the under.
According to Stats Insider's analytics model, the Royals (+1.5) are predicted to cover the line 59% of the time, while the 9-run over/under is expected to go over 52% of the time.
Royals vs Mariners: Best Bets
- Head to Head: Seattle at $1.83 with TAB
- Line: Royals +1.5 at $1.65 with TAB
- Total Runs: Under 9 at $1.91 with TAB
These Royals vs Mariners betting tips are based on detailed modelling and gambling intelligence to give you the best possible advice every day of the year.
Despite the Over being more likely to hit in this game, Under 9 is our best bet because of the better odds ($1.91) that are available from TAB.
Royals vs Mariners: Prediction
Stats Insider provides full betting coverage of the Kansas City vs Seattle game on Friday, including data-driven predictions and live win probabilitiestips.
Remember, our model updates regularly, so bookmark this page for the latest betting tips before the Kansas City vs Seattle game.
As always, see our Best Bets for betting tips for every MLB game, as well as predictions for a wide range of other sports.
Royals vs Mariners: Essential Details
The match-up between the Royals and Mariners at Kauffman Stadium is scheduled to commence at 4:10am AEST on Friday.
- Teams: Kansas City Royals vs Seattle Mariners
- Date: Friday 19 September 2025
- Time: 4:10am AEST
- Venue: Kauffman Stadium
All dates and times mentioned in this article are in Australian Eastern Standard Time (AEST), unless otherwise noted.
Conclusion
Our Kansas City vs Seattle predictions have been made after running 10,000 data-driven simulations of the game, all curated by our team of expert data scientists and analysts. We use the latest in predictive analytics technology and machine learning to ensure our MLB tips are trustworthy and reliable, giving you the confidence to make informed decisions.
If you decide to use our predictions for betting purposes, it's vital to gamble responsibly and know when to stop. For free and confidential support, call 1800 858 858 or visit gamblinghelponline.org.au.
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