Cubs vs Mariners Prediction and MLB Tips - 21 June 2025
Last updated: Jun 20, 2025, 6:21PM | Published: Jun 19, 2025, 10:28PM
The Chicago Cubs will sqaure off with the Seattle Mariners in MLB action at Wrigley Field on Saturday, beginning at 4:20am AEST.
Matthew Boyd (6-3, 2.79 ERA) will start on the mound for the Cubs, up against George Kirby (1-3, 5.96 ERA) for the Mariners.
This article features Stats Insider's prediction and tips for the Cubs vs Mariners game, plus the latest betting odds in Australia.
Who Will Win?
Using trusted machine learning and data, Stats Insider has simulated the outcome of Saturday's Cubs vs Seattle MLB match-up 10,000 times.
Our independent predictive analytics model gives the Cubs a 57% chance of winning against the Mariners at Wrigley Field.
Cubs vs Mariners: Odds
The current betting odds in Australia for Saturday's MLB game at Wrigley Field are shown below:
- Head to Head: Cubs $1.71, Mariners $2.20
- Line: Cubs -1.5 ($2.40), Mariners +1.5 ($1.61)
- Total (Over/Under 9.5 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 Cubs at $1.71 and the Mariners at $2.20.
The Cubs are 1.5-run favourites against the Mariners, with odds of $2.40 available at TAB.
For the underdog Mariners (+1.5) to cover the line, TAB offers odds of $1.61.
The over/under for total runs scored is set at 9.5 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 Mariners (+1.5) are predicted to cover the line 61% of the time, while the 9.5-run over/under is expected to stay under 53% of the time.
Cubs vs Mariners: Betting Tips
- Head to Head: Cubs at $1.71 with TAB
- Line: Mariners +1.5 at $1.61 with TAB
- Total Runs: Under 9.5 at $1.91 with TAB
Today's Cubs vs Mariners predictions are based on detailed simulations and gambling experience to help you place smarter bets with your chosen online bookie.
Cubs vs Mariners: Prediction
Stats Insider provides full betting coverage of the Cubs vs Seattle game on Saturday, including data-driven predictions and expert tips.
Our model updates regularly, so keep checking this article for the latest betting tips before the Cubs vs Seattle match-up.
As always, see our Best Bets for betting tips on every MLB game, plus predictions for a wide range of other sports.
Cubs vs Mariners: Essential Details
The match-up between the Cubs and Mariners at Wrigley Field is scheduled to start at 4:20am AEST on Saturday.
- Teams: Chicago Cubs vs Seattle Mariners
- Date: Saturday 21 June 2025
- Time: 4:20am AEST
- Venue: Wrigley Field
All dates and times in this article are in Australian Eastern Standard Time (AEST), unless otherwise noted.
Conclusion
Our Cubs vs Seattle predictions are based on 10,000 data-driven simulations of the game, all curated by our team of experienced data scientists and analysts. We use cutting-edge 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 MLB predictions for betting purposes, it's crucial that you 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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