Catch the Astros take on the Mariners this Sunday, September 21. Here's everything you need to know on how to stream the game.

Up two games in the AL West, the Mariners go for a huge sweep of the Astros in Houston on ESPN's "Sunday Night Baseball." Follow along throughout the game.

The Mariners jumped on Jason Alexander early and never looked back in sweeping the Astros in their three-game set.

Astros pitcher Luis Garcia, making his second start after sitting out more than two years while recovering from Tommy John surgery, exited because of right elbow discomfort.

Seattle Mariners catcher Cal Raleigh watches his solo home run during the third inning Saturday against the Astros in Houston. The home run, Raleigh’s 57th of the season, breaks the single-season Mariners record for home runs previously held by Ken Griffey Jr. (Jennifer Buchanan/Seattle Times)

Everything you need to know about the MLB matchup between the Houston Astros and the Seattle Mariners, including how to watch and team news.

Our Mariners vs. Astros predictions think Eugenio Suarez might just get the better of Jason Alexander on Sunday Night Baseball.

The ESPN BET promo code SOUTH will score a bet $10, get $100 bonus on any MLB and NFL Week 3 game, starting with Dolphins-Bills.

Expert recap and game analysis of the Seattle Mariners vs. Houston Astros MLB game from September 20, 2025 on ESPN.