Seattle Mariners vs Houston Astros Prediction 9/23/26 MLB Picks Today

The Houston Astros and the Seattle Mariners meet Wednesday in MLB action from T-Mobile Park. We will look at this from a betting perspective and determine the best bets for this game. Here’s a Houston Astros vs. Seattle Mariners prediction.

Starting Pitching Matchup

The Houston Astros will send out Ethan Pecko for the start here and Pecko is 1-0 with a 3.77 ERA and 19 strikeouts this season. Seattle will trot out George Kirby and Kirby is 9-11 with a 4.24 ERA and 143 strikeouts this season.

Houston Astros Recap

The Houston Astros come into this game looking to add on to their 7-0 win over Seattle last time out to sit at 78-79 this season. After this series, the Astros will head on the road for a series against the Athletics.

Astros Snap Three-Game Slide

Yordan Alvarez leads the Astros across the board with a team-high 172 hits, 41 home runs, and 102 RBIs while adding 32 doubles and a triple so far this season. Isaac Paredes has added 142 hits with 26 doubles, a triple, 23 home runs, and 91 RBIs, while Jose Altuve has contributed 126 hits with 24 doubles, 2 triples, 16 home runs, and 45 RBIs on the year. Christian Walker has logged 122 hits with 25 doubles, a triple, 26 home runs, and 83 RBIs, while Cam Smith has chipped in 103 hits with 17 doubles, 6 triples, 20 home runs, and 54 RBIs for Houston up to this point in the season.

Seattle Mariners Recap

The Seattle Mariners come into this game looking to rebound from their loss at the hands of the Astros on Tuesday to slip to 73-84 this season. After this series, the Mariners will head home for a game against the Los Angeles Angels.

Mariners Alternate Wins & Losses In 4 Straight

Josh Naylor and Randy Arozarena tie for the Mariners’ team lead with 154 hits each, with Naylor contributing 22 doubles, 10 home runs, and 54 RBIs while Arozarena paces Seattle across the board with a team-high 26 home runs and 76 RBIs along with 31 doubles and a triple so far this season. Julio Rodriguez has added 142 hits with 25 doubles, 21 home runs, and 66 RBIs, while Cole Young has logged 138 hits with 19 doubles, 4 triples, 17 home runs, and 65 RBIs on the year. Cal Raleigh has contributed 79 hits with 15 doubles, 23 home runs, and 68 RBIs, and Luke Raley has chipped in 59 hits with 9 doubles, a triple, 15 home runs, and 39 RBIs for Seattle up to this point in the season.

Houston Astros @ Seattle Mariners Betting Trends: September 23, 2026

• Probable Starting Pitcher: George Kirby      Record this season: 9-11      ERA: 4.24
• Home Record: 6-5
• Last 5 against Astros: 3-1

Why the Seattle Mariners will win

• The Mariners have won each of their last six night games against the Astros following a loss.
• The Astros have lost each of their last eight games as underdogs following a win.
• The Astros have failed to cover the run line in seven of their last eight night games against AL opponents following a win.
• The Mariners have covered the run line in each of their last four games against the Astros following a loss.
• The Astros have trailed after 5 innings in seven of their last eight road games against opponents that held a losing record.
• The Astros have lost the first inning in four of their last five games at T-Mobile Park.

• Probable Starting Pitcher: Ethan Pecko      Record this season: 1-0      ERA: 3.77
• Road Record: 1-0
• Last 5 against Mariners: –

Why the Houston Astros will win

• The Astros have won each of their last six road games against AL opponents that held a losing record.
• The Mariners have lost each of their last six night games against AL opponents following a home loss.
• The Astros have covered the run line in each of their last seven games as road underdogs against AL West opponents.
• The Mariners have failed to cover the run line in 11 of their last 12 home games against AL opponents.
• The Mariners have trailed after 5 innings in each of their last five home night games.
• The Astros have led after 3 innings in four of their last five games against AL opponents that held a losing record.

Total Runs Facts

• Seven of the Astros’ last eight night games against AL opponents have gone UNDER the total runs line.
• Eleven of the Mariners’ last 13 night games against AL opponents have gone OVER the total runs line.
• There has been at least one run scored in the first inning in 14 of the Astros’ last 15 games as road underdogs against AL West opponents.
• There has been at least one run scored in the first inning in each of the last six games between the Astros and Mariners.

Seattle Mariners Player Prop Facts

• Julio Rodriguez has hit a home run in three of the Mariners’ last four Wednesday night games at T-Mobile Park.
• George Kirby has recorded a win in four of his last five appearances with the Mariners as favorites against the Astros.
• George Kirby has recorded five or more strikeouts in each of his last eight appearances against opponents that held a losing record.
• Dominic Canzone has recorded at least one hit in each of the Mariners’ last 17 night games.
• Randy Arozarena ranks 10th amongst qualified players for On Base Percentage (.379) this season.

Houston Astros Player Prop Facts

• Isaac Paredes has hit a home run in four of the Astros’ last five games as underdogs against AL opponents.
• Isaac Paredes has recorded at least one hit in each of the Astros’ last 10 games as underdogs.
• Yordan Alvarez ranks 1st amongst qualified players for Batting Average (.314) this season.

Matchup/League Facts

• The Mariners rank 30th in the league for doubles this season (198).
• The Mariners rank 29th in the league for hits this season (1206).
• The Astros rank 30th in the league for steals this season (47).
• The Astros rank 29th in the league for walks allowed this season (631).

Houston Astros vs. Seattle Mariners Prediction

I’m on the Mariners here. I’m still not sold on Ethan Pecko’s game and this is a high pressure, high leverage spot for such a young arm. The Mariners aren’t headed to the postseason but I still think there’s more than enough here for the Mariners to come in and play spoiler so I’ll back Seattle in this one.