Chicago Cubs (74-56) at Seattle Mariners (62-68) | Sunday, August 23, 2026 | 3:10 PM CT | T-Mobile Park, Seattle, WA
This series has not gone the way anyone in Chicago expected. The Cubs dropped Fridayโs opener 6-5 and then lost an even tighter one Saturday, 5-4, to a Mariners team that looked completely finished after that infamous 22-0 loss in Milwaukee just days earlier. As a Cubs fan, back-to-back one-run losses to a sub-.500 team are the kind of results that test your patience, even for a club thatโs still 74-56 and comfortably in the playoff picture. Today, Shota Imanaga takes the mound looking to salvage this series and stop the bleeding before Chicago heads to Arizona.
Hereโs the full breakdown of todayโs series finale at T-Mobile Park: pitching probables, odds, and my honest final prediction.
Game Info: Cubs vs. Mariners
- Date: Sunday, August 23, 2026
- First Pitch: 4:10 PM ET
- Venue: T-Mobile Park, Seattle, Washington
- TV/Streaming: Marquee Sports Network, Mariners.TV
- Series: Seattle leads 2-0 after wins of 6-5 and 5-4
The Backdrop: A Cold Mariners Offense Finding Just Enough to Win
Thereโs a genuine mystery to how this series has unfolded. Seattleโs offense has been ice cold for weeks, and yet the Mariners have found a way to grind out two straight one-run wins against a Cubs team that came in averaging over five runs a game. Part of the explanation is that Seattle has been drawing a ton of walks even while struggling to hit for average, which has been enough to manufacture runs in tight, low-scoring games.
Chicago remains the better overall team by a wide margin โ a superior record, the number two scoring offense in baseball at 5.1 runs per game, and a roster built for a real playoff push. But two straight losses to a reeling opponent are the kind of results that can chip away at confidence if theyโre not answered today. A series loss here wouldnโt be fatal to Chicagoโs postseason hopes, but it would sting heading into a road trip against Arizona.
Probable Pitchers
Chicago Cubs: Shota Imanaga (8-9, 3.77 ERA)
Imanagaโs overall season numbers look solid, and heโs pitched at a high level across his last five starts by most traditional measures. But dig into the underlying data and thereโs a real red flag: opposing hitters have generated a barrel rate near 17% against him over his last three outings, a sign that even when the results have looked fine, the quality of contact allowed has been trending in the wrong direction. Todayโs Seattle lineup, cold as itโs been, has shown it can still find ways to do damage against a starter who isnโt missing bats at his usual level.
Seattle Mariners: Bryce Miller (4-7, 3.71 ERA)
Miller has had an up-and-down season, and like Imanaga, heโs dealing with his own contact-quality concerns โ opponents have posted an elevated barrel rate against him as well. Heโs chasing his fifth win of the season, and against a Cubs lineup thatโs been productive all year, today is a real test of whether he can put together a clean start.
Betting Odds for Cubs vs. Mariners
- Moneyline: Nearly a dead heat, with lines ranging from Chicago -130 to +110 depending on the book, and Seattle correspondingly priced between -104 and +110
- Total: 7.5 to 9 runs, depending on the sportsbook
The spread in these numbers tells the story of this series pretty well. Some books are leaning on Chicagoโs clearly superior roster and offensive numbers, while others are respecting Seattleโs ability to grind out close wins the last two nights, plus the shakier underlying stuff from both starters today. That combination points toward a game that could realistically go either way, and possibly one with more scoring than the low totals from Friday and Saturday suggested.
Key Storylines to Watch
Can Chicago finally solve this Seattle team? The Mariners have found a way to win two straight despite a lineup thatโs been genuinely cold. Something has to give today, and the Cubsโ offense โ the second-best scoring unit in baseball โ is due for a breakout against a Mariners team thatโs been playing above its underlying numbers.
Randy Arozarena has real platoon value against Imanaga today. Hitting from the opposite side that Imanaga throws from and getting the benefit of the home crowd, heโs a name to watch early in this game.
Pete Crow-Armstrong and Michael Busch both carry real platoon advantages today. Both are hitting from the opposite side of Bryce Miller, and Crow-Armstrong in particular pulls a huge share of his fly balls toward one of the shallower fences in this ballpark.
Seattleโs suspect infield defense could be an X-factor. The Marinersโ infield defense projects as one of the weakest units on the entire MLB slate today, which could turn borderline plays into extra bases for a Cubs team thatโs shown it can pressure a defense.
Prediction: Cubs vs. Mariners
I trust this Cubs offense to break out of its recent funk today, especially against a Mariners defense that projects as genuinely shaky and a Seattle lineup thatโs been surviving more than thriving. Both starters have some concerning underlying trends, which suggests today could turn into a higher-scoring affair than the last two nights. I think Chicagoโs superior overall talent finally shows up on the scoreboard.
As a Cubs fan, I need this one. Give me Chicago avoiding the sweep behind a bounce-back effort from the lineup.
Final Score Prediction: Chicago Cubs 7, Seattle Mariners 5
Odds, probable pitchers, and injury statuses are subject to change ahead of first pitch โ always confirm the latest lineups and lines before placing any wagers. This article is for informational and entertainment purposes only.
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