How to Watch Cubs at Mariners
T-Mobile Park · Seattle, WA · Friday, August 21, 2026. Here's first pitch, the TV channel and the live stream.
▶ Watch on Mariners.TV- GameCubs at Mariners
- AwayChicago Cubs
- HomeSeattle Mariners
- DateFriday, August 21, 2026
- First pitch10:10 PM ET (your local time on the live schedule)
- BallparkT-Mobile Park, Seattle, WA (a 47,929-seat grass ballpark with a retractable roof)
- Watch onMariners.TV (Mariners market) or Marquee Sports Network (Cubs market) ↗
How to watch Chicago Cubs at Seattle Mariners
Cubs at Mariners — Chicago Cubs visiting Seattle Mariners at T-Mobile Park in Seattle, WA — is set for Friday, August 21, 2026, with first pitch around 10:10 PM ET. The game airs in-market on Mariners.TV. National carriers don't have this one.
On TV: this is an in-market game — it airs on Mariners.TV (Mariners market) or Marquee Sports Network (Cubs market) from about 10:10 PM ET, not on a national channel.
Streaming: in-market via Mariners.TV (Mariners market) or Marquee Sports Network (Cubs market) or a live-TV package that carries it; out of market on MLB.TV.
Tap Watch on Mariners.TV to go straight to the broadcast. For the full week of baseball across every club — with times auto-converted to your local zone — see the complete schedule or today's watch guide.
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About T-Mobile Park
Home of the Seattle Mariners in Seattle, Washington, it opened in July 1999 as Safeco Field and was renamed T-Mobile Park on January 1, 2019. Its retractable roof covers the seating and field like an umbrella rather than sealing the stadium, so wind and outside temperatures still affect play when it is closed.
Hosted the MLB All-Star Game in 2001 and 2023, and two perfect games in 2012 (Philip Humber and Felix Hernandez).
Frequently asked questions
What time does Cubs at Mariners start?
First pitch is scheduled for 10:10 PM ET on Friday, August 21, 2026. Times are US Eastern — the live schedule at BaseballOnTV.net converts them to your local zone.
What channel is the Mariners game on tonight?
There's no national broadcast of this one — it's an in-market game. Watch it on Mariners.TV (Mariners market) or Marquee Sports Network (Cubs market). Outside those markets it's an out-of-market game on MLB.TV.
How can I stream Cubs at Mariners live?
In-market, stream it through Mariners.TV (Mariners market) or Marquee Sports Network (Cubs market) or a live-TV service that carries it. Out of market, it streams on MLB.TV.
Where is Cubs at Mariners being played?
At T-Mobile Park in Seattle, WA, a 47,929-seat grass ballpark with a retractable roof.
Is Cubs at Mariners blacked out on MLB.TV?
MLB.TV is an out-of-market product: live out-of-market regular-season games are included, but games are blacked out in each club's home television territory, where they air on that club's in-market channel or stream instead. Nationally exclusive games (for example FOX Saturday games) are also blacked out on MLB.TV. Audio for all 30 clubs is blackout-free. As of 2026, ESPN sells and distributes MLB.TV, and it is also available through MLB's own platforms.
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