Venue: T‑Mobile Park — Seattle, WA
Scheduled First Pitch: 6:40 PM PT / 9:40 PM ET
Television: Marquee Sports Network / ROOT Sports NW / MLB.TV**
Weather Forecast — Seattle, WA
T‑Mobile Park has a retractable roof. Weather determines run environment.
Temperature: 76°F
Humidity: 64%
Wind: 10 mph blowing out to right field
Rain Chance: 22% Roof Status: Likely open — slightly hitter‑friendly, especially for left‑handed pull hitters.
Wind blowing out boosts HR probability for Bellinger, Happ, France, and Raley.
Injury Report
Chicago Cubs
Seiya Suzuki — OUT (hamstring)
Dansby Swanson — OUT (wrist)
Justin Steele — OUT (shoulder)
Ben Brown — OUT (lat)
Michael Busch — Day‑to‑day (ankle)
Adbert Alzolay — OUT (elbow)
Seattle Mariners
George Kirby — OUT (forearm)
Logan Gilbert — OUT (shoulder)
J.P. Crawford — OUT (back)
Matt Brash — OUT (UCL)
Cal Raleigh — Day‑to‑day (knee)
Julio Rodríguez — healthy
Seattle is missing major rotation pieces and their shortstop. Cubs are missing Swanson and Suzuki but retain their core power bats.
Starting Pitching Matchup
CHC — RHP Drew Peterson
(2026 Season: 11–7, 3.46 ERA, 1.18 WHIP) Peterson has been a breakout force in the Cubs rotation.
Strengths:
Excellent fastball/slider combo
Strong command
Dominates right‑handed hitters
Road ERA: 3.29
Weaknesses:
Occasional HR issues
Mariners rank 8th in MLB vs sliders
Vulnerable when forced into fastball counts
Mariners vs Peterson profile:
Julio Rodríguez: .302 vs high‑velo fastballs
Ty France: .288 vs sliders
Raley: .511 SLG vs RHP
SEA — RHP Bryce Anderson
(2026 Season: 6–10, 4.41 ERA, 1.31 WHIP) Anderson is a young arm with upside but inconsistent command.
Strengths:
Good sinker/curveball mix
Generates ground balls
Effective vs right‑handed hitters
Weaknesses:
Struggles vs left‑handed power
Cubs rank 6th in MLB vs sinkers
Vulnerable when behind in counts
Cubs vs Anderson profile:
Bellinger: .540 SLG vs RHP sinkers
Happ: .302 vs curveballs
Hoerner: elite contact vs sinkers
Key Player Matchups
Cody Bellinger vs Bryce Anderson
Bellinger crushes sinkers
Wind blowing out to right Edge: Bellinger
Julio Rodríguez vs Drew Peterson
Julio handles high‑velocity fastballs
Peterson dominates righties overall Edge: Slightly Peterson
Ian Happ vs Mariners Bullpen
Mariners bullpen ERA: 4.62
Happ thrives vs middle relief Edge: Happ
Ty France vs Peterson
France’s contact vs Peterson’s slider Edge: Slightly France
Recent Team Form
Chicago Cubs — Last 10 Games: 7–3
Offense averaging 5.0 runs/game
Rotation stabilizing
Road record: 35–30
Bellinger + Happ surging
Seattle Mariners — Last 10 Games: 4–6
Offense inconsistent (3.9 runs/game)
Rotation depleted
Home record: 33–33
Julio carrying lineup
Cubs enter significantly hotter and more stable.
Series History
2026 Season Series
First meeting of the season
Last season: Cubs won 2 of 3
Peterson vs SEA last year: 6 IP, 2 ER, 7 K
Anderson vs CHC last year: 5 IP, 3 ER
At T‑Mobile Park (Last 3 Years)
Mariners lead 4–3
Average total runs: 7.9
Wind‑boosted games trend over
Betting Trends
Chicago Cubs
7–3 in last 10 road games
6–1 in Peterson’s last 7 starts
Over is 6–4 in last 10 Cubs games
Seattle Mariners
3–7 in last 10 home games
2–5 in Anderson’s last 7 starts
Mariners ML has hit in 42% of games as home underdogs
Head‑to‑Head Trends
Cubs have won 4 of last 6
Over has hit in 5 of last 8
Game Odds
Chicago Cubs 7.5
Seattle Mariners – 117
Odds Courtesy of Sports Odds Direct as of Friday, August 21, 2026
